Malicious PDF — malware analysis report

Static analysis result for SHA-256 594f21d78826d34f…

MALICIOUS

PDF

100.7 KB Created: 2021-06-13 10:51:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 03b056f10a10cc03a47bb559344a5242 SHA-1: 7586df515588f554bc4f14d409daf74b00ab3461 SHA-256: 594f21d78826d34fc7b9bb672c9f1890f540c532023199e22c7be2213e3371b5
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous external links to various domains, including suspicious ones like resalured.ru. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create documents for SEO manipulation or to host phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://resalured.ru/wb?keyword=what%20is%20the%20meaning%20of%20tanyard PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4463533/normal_5fea0c76187a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483083/normal_6014be9f7230d.pdfIn PDF document text
    • https://juwarojolajekol.weebly.com/uploads/1/3/4/1/134108785/katofin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465938/normal_604ec5ee7eb5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453142/normal_603bfd4086364.pdfIn PDF document text
    • https://rupekiduwixe.weebly.com/uploads/1/3/4/7/134774185/899288516503bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416805/normal_6058e18eca01f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494429/normal_60656c6d578a2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409826/normal_5ffb16d18dcbb.pdfIn PDF document text
    • https://zobojosapez.weebly.com/uploads/1/3/1/4/131483592/zunujesivenubo-wapamu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475203/normal_5fe9c9cf9de10.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485578/normal_5fd07b28ccf5a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454436/normal_5fe15260b97cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474457/normal_60667a56ef415.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370288/normal_6021a41061ed6.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4472491/normal_60b2f2e08c6a0.pdfIn PDF document text
    • https://sojagimizalafar.weebly.com/uploads/1/3/5/3/135317111/1127743.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://smc.org.in)MeeraRegularMeera2016SMC7.0.0+20171102HussainIn PDF document text
    • http://smc.org.inhttp://smc.org.inIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb5833b7-4a19-4e5b-b7b8-936bab14265e/xoripufijasobijelonefe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91cb0ddb-a1ea-4b53-a64f-ee27fd891217/70137306341.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25363c65-8ee5-45ff-b4a4-9e18ccf52c9a/66767547409.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7af54dd-db6b-4dd7-9c6a-40bead851942/craftsman_125_psi_1_hp_12_gallon_air_compressor_price_texas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6aa0cdd8-576e-4914-9064-7cc75fa5af37/jandy_lx_pool_heater_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73a5914e-966a-4f0c-97b6-97e084a283d9/edgar_schein_organizational_culture_and_leadership_3rd_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac3ae8ed-7071-4a85-bf7e-fd5c26e27385/road_trip_movie_cast_blind_girl.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc0a63df-a02b-4a49-8d72-6dedc813eb68/39032403517.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • https://gitlab.com/smc/meera/blob/master/COPYINGIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF372 5404 bytes
SHA-256: 1df9cd6b70e2f3faf2cdad31fd2af42fc081c74516dc79fdb1da53b6351ab221
font_01_sfnt_off000105ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AE 27264 bytes
SHA-256: 98306ec422c9386cfe18670331805029dc85dd6c5a0a3e232b718b2dcebc53aa
font_02_sfnt_off0001514d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1514D 11508 bytes
SHA-256: e5bd0dffc968f9826d0a210918e3ebd4d04aef97b6371da1dc92eaf550618443
font_03_sfnt_off000178b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178B7 2960 bytes
SHA-256: a62a5545dc4d720e446cbd25bb19e1a28ce04ce6744d84150ca21b1ac38355be

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