Malicious PDF — malware analysis report

Static analysis result for SHA-256 6db75a78d19e1872…

MALICIOUS

PDF

116.1 KB Created: 2021-05-30 19:25:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 96857a89b8cede478a6245a619d610c3 SHA-1: 844bafa060178460f0518142b287ff0a961d92e7 SHA-256: 6db75a78d19e187205e8176ba552018e5f6015f996a86435e5e94e3f4902e5f9
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious sites for credential harvesting or further payload delivery. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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/strik?utm_term=cgeit+review+manual+free+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4388613/normal_6005a4ee4dcde.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381751/normal_601a1009570cf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393483/normal_5ff41c39a0f59.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447101/normal_5fc6c66dd95c5.pdfIn PDF document text
    • https://tuboxivodase.weebly.com/uploads/1/3/4/3/134387713/854d8859e3c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476285/normal_5fc85e7bcc576.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/0edc1c047a0.pdfIn PDF document text
    • https://venolebibu.weebly.com/uploads/1/3/5/3/135348563/8879439.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401714/normal_5fd8d2bb0e968.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473902/normal_5fff7d626832f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410433/normal_6062006d1f37f.pdfIn PDF document text
    • https://dutajidadu.weebly.com/uploads/1/3/4/7/134730474/kuwenalap_ropinubesuk_relimuxa_sowareg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530712/normal_5fdae409418dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451376/normal_5fe969c2d9323.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472773/normal_603b38efef5b4.pdfIn PDF document text
    • https://towizitubozabo.weebly.com/uploads/1/3/5/4/135400713/wimibim_noribepufiliped_rudutatinu_xibuv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9ab6499-0b1d-4531-8f27-b96104fb5842/is_the_fitbit_inspire_better_than_the_charge_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3e17d9a-9bf7-458d-bd9e-534ec0c8448b/jazim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/999c18b1-227b-4daa-a2c9-f8e491df4533/davinci_kalani_4-in-1_convertible_crib_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac159d2f-db92-47f6-a6fd-91703565e12f/how_to_read_wella_color.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56c77ff8-5f4f-4dd9-9a74-7196c9931303/what_are_six_major_biomes_found_on_earth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d49bd2b4-b1f2-421e-bd40-d0f3742fafe1/11542457214.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6ec3b89-8e3a-43ba-a565-fa3c92f2a25e/twitter_icon_emoji_copy_and_paste.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18780 5108 bytes
SHA-256: a9856f751f165c0bddb05644f428288ebd9051209e43bbeab20d5231d22a642a
font_01_sfnt_off000198da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x198DA 11816 bytes
SHA-256: 0b94c10c2bb83a7e320a52645603b9306c9e587608fcc7680e2e4401d9938e30