Malicious PDF — malware analysis report

Static analysis result for SHA-256 efa170874c553c89…

MALICIOUS

PDF

79.0 KB Created: 2021-03-24 05:29:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: b2830f5d41227e542df5607786067ff2 SHA-1: b06288c276a98b5eb82145d6a0e9384cbdd5c261 SHA-256: efa170874c553c893c3a934ad5e17c9482a4c733a5874d16fc7a68a72deaf9b7
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as 'Pdf.Phishing.Trojan' and by an ML classifier with high confidence. It contains a large number of external links, many pointing to benign PDFs, but at least one, 'https://baarspo.ru/123?utm_term=bootstrap+form+template+snippet', is flagged as unknown and is part of a heuristic indicating a PDF link farm. This suggests the document's primary purpose is to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/123?utm_term=bootstrap+form+template+snippet PDF link annotation
    • http://relibafogat.sportsontheweb.net/88458040053.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473947/normal_5fce17c76f5e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426072/normal_6048cd76d9d01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468530/normal_604f03f3c90b8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450876/normal_5fe0ce2f08dcf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417815/normal_60523a11b7f5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444386/normal_603e532f11daa.pdfIn PDF document text
    • http://sovuradema.medianewsonline.com/xaxebotegewu.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/likerajatob/belik.pdfIn PDF document text
    • https://s3.amazonaws.com/kefefetafij/osha_office_ergonomics.pdfIn PDF document text
    • https://0a01f052-6ee6-4bfa-868d-d2e49373b03f.filesusr.com/ugd/55f640_97b99c2ca60b49eea4f832ee3e4b5b51.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/what_is_an_author_contribution_statement.pdfIn PDF document text
    • https://d7e981a8-8c4a-445e-aef0-60d3d4911bd2.filesusr.com/ugd/65d69c_7b1ccd6430ec48d597d4e8d8b71b3108.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/leributafa/biostar_g41d3_audio_driver.pdfIn PDF document text
    • https://s3.amazonaws.com/wifukedot/lofafigewixipubuj.pdfIn PDF document text
    • https://s3.amazonaws.com/xelimewat/honeywell_chronotherm_iii_wiring.pdfIn PDF document text
    • https://s3.amazonaws.com/gatazeromij/craftsman_garage_door_opener_keypad_repair.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_off0000fb0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0E 5096 bytes
SHA-256: 6d3040490f88ad4d43e2ac0698c889366e5e9531ecfeaa9c8984e671cf5d9795
font_01_sfnt_off00010c50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C50 10208 bytes
SHA-256: a05f7a8a2c7a71535c280a9c4c41af6bfab88d29e2062c73b3d590a5861f17da

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