Malicious PDF — malware analysis report

Static analysis result for SHA-256 f11c7eae70ff8db8…

MALICIOUS

PDF

71.6 KB Created: 2021-03-09 18:07:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 373b2872642fef88abf351b7a088068e SHA-1: b2aeed06abc10ce0a1536a98fd1dadff87f8b3b1 SHA-256: f11c7eae70ff8db80c7c4098b2d6e7bc5f28b997fc832aa4bf2e617eb56253ff
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, likely intended to manipulate search engine results or direct users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, with the PDF being flagged as a phishing trojan. While no scripts were explicitly extracted, the presence of numerous external URLs suggests a phishing or content redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gimoguvi.ru/award?keyword=relationship+between+archaeology+and+anthropology+pdf PDF link annotation
    • http://itasummer.fun/44753784663q0h4m.pdfIn PDF document text
    • http://wssummer.space/congruent_triangles_worksheet_answers_keywx3ev.pdfIn PDF document text
    • https://dusonibegoxat.weebly.com/uploads/1/3/1/3/131380688/7933086.pdfIn PDF document text
    • https://vopuxobud.weebly.com/uploads/1/3/5/9/135974080/noxoligeli_womowukediviliv_wisoguzosukasi.pdfIn PDF document text
    • http://neyroskakalka.site/the_iron_druid_chronicles_downloadb1hom.pdfIn PDF document text
    • http://idealica-uficiale.website/attack_of_light_mod_apkav8ri.pdfIn PDF document text
    • http://lazotub.mywebcommunity.org/sailing_knots_for_fenders.pdfIn PDF document text
    • https://tudexabi.weebly.com/uploads/1/3/4/7/134770635/1822552.pdfIn PDF document text
    • https://jagefefax.weebly.com/uploads/1/3/4/2/134235663/jowozisamewozefef.pdfIn PDF document text
    • https://xekawipafamut.weebly.com/uploads/1/3/4/3/134328312/9307886.pdfIn PDF document text
    • http://upsbox.ru/lowulisogijefemzyy1.pdfIn PDF document text
    • https://sobasoje.weebly.com/uploads/1/3/2/6/132695832/3281668.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zotubune.myartsonline.com/dirt_devil_power_express_upright_vacuum_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78b6751a-4ca8-4d59-9971-90d15317abc1/what_is_error_code_s0a00_comcast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca1555a8-73f5-477e-8887-281e8ab8ad26/97398828601.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d8351d5-d798-4d8a-a467-246bacf18bb1/diversity_equity_and_inclusion_statement_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eef1df4e-4bd4-4e04-abf1-8047dcb367e1/yamaha_receiver_rx-v473_manual.pdfIn PDF document text
    • http://kozogasivufi.myartsonline.com/66617560594.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxepiduded/mendeley_format_bibliography_word.pdfIn PDF document text
    • https://s3.amazonaws.com/mamibis/yahoo_mail_exe.pdfIn PDF document text
    • https://doi.org/10.1007/9In 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_off0000d99f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99F 5756 bytes
SHA-256: 5171e84be8f353b60336e3fe60087dd549e05ec792c23950d55cadf789e920a0
font_01_sfnt_off0000ed4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4B 10280 bytes
SHA-256: 7bde2fe2519d1c2b2800f2109b2bcc4050f5979b5dd0a419d69cc9573f62faa1