Malicious PDF — malware analysis report

Static analysis result for SHA-256 873998e8e531417e…

MALICIOUS

PDF

69.0 KB Created: 2021-01-03 11:50:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: dd05a022b0334b17e0df6a33430ddf9b SHA-1: 745bfe1e4cc54bf98a38dcfeebefa18f1194f0cb SHA-256: 873998e8e531417e3da12ce3807d1c0e65cb7ffb0ff04424c564c90b8c924725
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one pointing to 'traffnew.ru', a domain flagged for suspicious activity. The heuristic 'PDF_SEO_LINK_FARM' indicates a pattern of creating numerous links, often for SEO manipulation or to host malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure suggest an attempt to redirect the user to a malicious site, likely for phishing or to download a secondary payload.

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://traffnew.ru/aws?utm_term=sample+paper+chromatography+lab+report PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369146/normal_5f8eb2977c3e5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367644/normal_5fcb63737e645.pdfIn PDF document text
    • https://tupalomixesitet.weebly.com/uploads/1/3/1/3/131379559/favikideguk.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/b9206af4-ad83-446a-856d-c7471f123494/60866191170.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b557762-134c-4ed3-8b35-61ec17518ab2/bazadi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0388b96f-1efa-4315-a018-2239470b52d1/509_bus_schedule_nj_transit.pdfIn PDF document text
    • https://s3.amazonaws.com/dazovosugev/intent_in_android_studio_javatpoint.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/black_belt_memory.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/853eecf3-d6fa-491e-a01e-963068d268e9/zotaj.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/trolls_movie_google_drive_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/luxaduzimase/method_maths_answers_june_2017_2f.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_off0000d048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD048 5516 bytes
SHA-256: fb21cb8da3f723d60a565bf6e0362ae4bea1229ee923fb0275012614df0429fc
font_01_sfnt_off0000e2e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E2 10576 bytes
SHA-256: 5b2207ffbfe6da2c0e20f14d7513c0a261d5082427b1ab7a1957f5e2a5012134

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