Malicious PDF — malware analysis report

Static analysis result for SHA-256 5af501fdc9567c18…

MALICIOUS

PDF

85.3 KB Created: 2021-05-18 03:17:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: d3cefebb029b990873087321e669c481 SHA-1: d7941c840f9961d792ed827e7118b6a7bb6111a1 SHA-256: 5af501fdc9567c185a90c3f195c6db18eeb3df2678f18b9eafd63a6d7dc7f3c5
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to benign-looking PDFs, but one critical link to 'xezojetit.ru' which is likely malicious. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' suggest this PDF is part of a link farm designed to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xezojetit.ru/strik?utm_term=how+to+get+rid+of+water+softener+resin PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393776/normal_6054702e0504b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473947/normal_6031049798717.pdfIn PDF document text
    • https://jitugexe.weebly.com/uploads/1/3/0/9/130969989/3607357.pdfIn PDF document text
    • https://kifeketefisub.weebly.com/uploads/1/3/5/3/135347095/busujonaxovone_mesekuwukogijo_dipifirejis.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477163/normal_5ffaed29edef1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372085/normal_6052c728ec458.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/jujojomojemiz/rawajavenuxirepanija.pdfIn PDF document text
    • https://s3.amazonaws.com/laradusa/mitosis_vs_meiosis_worksheet_17.pdfIn PDF document text
    • https://s3.amazonaws.com/zisulamisozoto/formation_d_infirmier_anesthsiste.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/what_is_hegel.pdfIn PDF document text
    • https://s3.amazonaws.com/jusagi/36692781048.pdfIn PDF document text
    • https://s3.amazonaws.com/fizup/40123938504.pdfIn PDF document text
    • https://s3.amazonaws.com/lunojol/disney_character_height_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/008a3ec3-58af-41d4-8456-ff2de355b332/washington_gas_credit_union_login.pdfIn PDF document text
    • https://s3.amazonaws.com/legenapi/bhojpuri_dj_remix_song_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/dazovosugev/best_books_on_the_fall_of_rome.pdfIn PDF document text
    • https://s3.amazonaws.com/wujanozo/zasonugixemafot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87cb59b6-afaa-4557-8bae-116874ecc970/xitizonapanovimolapi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e7638d8-8c96-46c2-b52f-5c9c19ae51a7/51335901156.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxagixil/assault_on_precinct_13_2005.pdfIn PDF document text
    • https://s3.amazonaws.com/medaliwifufugel/good_girl_boss_memes.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_off00010e9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E9F 5096 bytes
SHA-256: 6244b53593570abd612bd5cfcc0ecd52011df6dd7498882af57ecc733bd05d6e
font_01_sfnt_off0001201a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1201A 11100 bytes
SHA-256: bd7caf64525faa8abeb14dee90800d4be0fe79f2f121dfc9b15d96e6f8564ba5

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