Malicious PDF — malware analysis report

Static analysis result for SHA-256 91a2f7d6bbfc88f8…

MALICIOUS

PDF

71.5 KB Created: 2020-12-18 13:57:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 568d07bb86eb71649a81885c794f7eaf SHA-1: 739020a654df9e1fb1a9a6dd6f1b59d085874d9b SHA-256: 91a2f7d6bbfc88f8b97ee081051c8be5705785307ff5933743adb1171e47e179
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for phishing or distributing further malware. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content, possibly exploiting PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://trafficel.ru/aws?utm_term=ballers+season+1+soundtrack PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368223/normal_5f8b3d3a009b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392237/normal_5fc2989a48b80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372076/normal_5fb5d5ea32107.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365552/normal_5f8893143b6db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499329/normal_5fd19f4cbfe0e.pdfIn PDF document text
    • https://donaxitod.weebly.com/uploads/1/3/4/6/134688316/1697024.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/5968fe01-627b-4111-8ba0-855672ccd402/wow_classic_skinning_and_leatherworking_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/bakoloj/wutuvobepopetul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e10f8e3-5da8-4f0a-8f45-bd3a75ae14cf/nuzewibejewofukav.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc64a44a3bf4b14abcdd78e/t/5fd21fddef89ac66837eacc4/1607606261384/adventure_capitalist_online_free.pdfIn PDF document text
    • https://s3.amazonaws.com/susonanezaj/hyper_light_drifter_guide_north.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0f88bd26ff1194f740ef3/t/5fcbc52d26a2be7f6decd711/1607189806807/zakimukeminurawifek.pdfIn PDF document text
    • https://s3.amazonaws.com/sibenuvokiwuz/foscam_subnet_doesn_t_match.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwenoxuzasila/42214917504.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48ee6109-8665-4da2-9b7a-44474ee8b899/navozolo.pdfIn PDF document text
    • https://s3.amazonaws.com/nelizenejakarug/autocad_2010_free_online.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_off0000d56b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56B 5100 bytes
SHA-256: cd308b5955433262dd5a87ed1a055821f72c19eb2e9652619477dc7ee44aa90f
font_01_sfnt_off0000e6d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D5 11952 bytes
SHA-256: 34e5cb6ddc2c365c7e872146121ce81b0ea432ec17d7d1d347715c3f8b8fbe43

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