Malicious PDF — malware analysis report

Static analysis result for SHA-256 847de791fae8972d…

MALICIOUS

PDF

106.4 KB Created: 2021-01-15 07:13:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 9bf4a1683b79f972da2a02e17bedc650 SHA-1: 403740a09481cc224726cae7e7cbfc8a9b703dc6 SHA-256: 847de791fae8972d0e071c6050dff4156d6df7eebe23ca54fe95e9d342f7703a
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffine.ru/123?utm_term=spelling+power+grade+7+answer+key PDF link annotation
    • https://cdn.sqhk.co/jezuleku/cjawcii/shopping_list_for_type_2_diabetes.pdfIn PDF document text
    • https://cdn.sqhk.co/mevexobuzur/jEijaii/word_board_ideas.pdfIn PDF document text
    • https://site-1246235.mozfiles.com/files/1246235/asra_anticoagulation_guidelines_2017.pdfIn PDF document text
    • https://cdn.sqhk.co/telapunojawu/eEjjfii/field_hockey_defense_tips.pdfIn PDF document text
    • https://site-1176958.mozfiles.com/files/1176958/thuc_metformin_stada_850.pdfIn PDF document text
    • https://cdn.sqhk.co/riketumes/imiggcp/dv247_music_store_voucher_code.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378379/normal_5fad60221443c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456132/normal_5fda00a93ef65.pdfIn PDF document text
    • https://cdn.sqhk.co/bikezuku/T75jfVD/life_is_strange_comic.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483070/normal_5fda4e7252aa6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408177/normal_5fbd3d265ca0d.pdfIn PDF document text
    • https://pizipeko.weebly.com/uploads/1/3/4/6/134611096/434463.pdfIn PDF document text
    • https://nepokotivo.weebly.com/uploads/1/3/2/8/132814168/7f6404abc43c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/boston_globe_crossword_puzzle_answers.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_off00016281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16281 5568 bytes
SHA-256: 2745a7dac0c6191bf58a0beb23d0c700f392ac04e9d57275ddadcdf008334b19
font_01_sfnt_off000175a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175A5 11800 bytes
SHA-256: 2f453f5eb9124fd982c4985cc7ecc8e71c4933ff1da0236c1c0c4ccdf84843e4

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