Malicious PDF — malware analysis report

Static analysis result for SHA-256 09031c582c0ca6b1…

MALICIOUS

PDF

66.6 KB Created: 2020-12-04 13:41:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c05f63defcb49399931accaeda425220 SHA-1: 12ac02669d1797ef7c99d9ce2369db3d3eac2540 SHA-256: 09031c582c0ca6b12d8349db73fe7a86f773e02f5e00e19ccdbbedcdbbf63f65
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used to create link farms for SEO manipulation or to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to exploit users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffking.ru/aws?utm_term=free+assured+shorthold+tenancy+agreement+form
    • https://cdn-cms.f-static.net/uploads/4366017/normal_5f86f5a413a3e.pdf
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/fesixukorupu.pdf
    • https://lumixomenuvaw.weebly.com/uploads/1/3/4/7/134745504/5d8d9576f34.pdf
    • https://zilowefid.weebly.com/uploads/1/3/4/5/134510497/5a9299e8c7a2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sasufufa/bdo_witch_combo_guide.pdf
    • https://s3.amazonaws.com/kabisebax/canon_pixma_mg5320_user_manual.pdf
    • https://uploads.strikinglycdn.com/files/c75abb3c-5c4d-4339-8b28-a7b55ae88d60/livedibezonotonotawexes.pdf
    • https://s3.amazonaws.com/vibove/ethan_allen_coffee_table_glass_top.pdf
    • https://static1.squarespace.com/static/5fc58b7f104edf1d77a09da7/t/5fc8993746ef2e08cbb9dd79/1606981944189/best_pumpkin_bars_with_cream_cheese_frosting.pdf
    • https://s3.amazonaws.com/pukaridimupo/adventures_of_tintin_subtitles_english.pdf
    • https://s3.amazonaws.com/vixuwogetiv/handlebars_trumpet_solo_sheet_music.pdf
    • https://s3.amazonaws.com/kofabube/theme_of_once_upon_a_time_nadine_gordimer.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdf8ce3c6ccf69f3245cf9/1606285521288/80860905502.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c812.bin
e42ede5290c81a9eb6f9443922d2e580df9695ae21954fb04d72ff3de2d277c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC812 5492 bytes
font_01_sfnt_off0000daa1.bin
ed68016e91d46c1655c70b16bee14828f71439f1f97533c0671fc78bc0ab1e13		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA1 10180 bytes

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