Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8f0b22f2fa74387…

MALICIOUS

PDF

74.4 KB Created: 2021-01-14 12:41:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 5382045be211851a13b91036478b0231 SHA-1: 7f533d9bbecd31b28d338200131ddf5314074f27 SHA-256: b8f0b22f2fa74387256728c45b668568bab9695645938dc263449eb2da12672a
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one prominent URL suggesting a lure related to accounting study guide answers. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm on disposable hosting, and ClamAV detection confirms this PDF is malicious, likely a phishing or malware distribution attempt. No scripts were extracted from this sample, but the presence of numerous external links points towards a malicious intent to redirect the user.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://trafficel.ru/123?utm_term=south+western+accounting+chapter+14+study+guide+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4423454/normal_5fdae69cbf229.pdfIn PDF document text
    • https://site-1166749.mozfiles.com/files/1166749/super_car_racing_multiplayer_mod_apk_unlimited_money.pdfIn PDF document text
    • https://site-1177991.mozfiles.com/files/1177991/73242841674.pdfIn PDF document text
    • https://site-1176181.mozfiles.com/files/1176181/bottle_flip_3d_mod_apk_unlimited_money.pdfIn PDF document text
    • https://site-1174757.mozfiles.com/files/1174757/fast_and_furious_car_game_download.pdfIn PDF document text
    • https://site-1172655.mozfiles.com/files/1172655/16809144514.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486037/normal_5fffedffb6598.pdfIn PDF document text
    • https://site-1207676.mozfiles.com/files/1207676/50779291163.pdfIn PDF document text
    • https://kibalenujodoziz.weebly.com/uploads/1/3/0/7/130776895/2519102.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393625/normal_5fb50a01541e3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451766/normal_5ff3f09d06118.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485828/normal_5feb2e8410d86.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/wesezuzuvalirik/38710666684.pdfIn PDF document text
    • https://s3.amazonaws.com/dinisemowoge/automotive_lighting_design.pdfIn PDF document text
    • https://s3.amazonaws.com/fadedosi/34912579121.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_off0000e32f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32F 5740 bytes
SHA-256: 17600b62d05f14d95d5e4b75b19b61d20862ad1d202583e47eb46bbf8e09c740
font_01_sfnt_off0000f6d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D2 11112 bytes
SHA-256: ebcc69f5c234c93409f8024f548c3756bfecae53677708e989b101e1bf42c1ad

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