Malicious PDF — malware analysis report

Static analysis result for SHA-256 c58a12fcca598751…

MALICIOUS

PDF

76.8 KB Created: 2021-03-11 20:59:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dcf979796ed8fb49f3aca7fbd6a34dbe SHA-1: 255daff8606057815d8951d7aafbfff10eb97824 SHA-256: c58a12fcca5987519c323ddd8d89a0b34f5242358e13a21df4e79d45247f267b
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with several pointing to disposable domains and potentially malicious content, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic and ClamAV detection. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains references to academic content and application metadata, suggesting a lure to disguise malicious links.

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://maypoin.ru/award?keyword=academic+english+course+pdf
    • http://prostosite.site/miller_welder_service_schoolaew79.pdf
    • http://jisuvakuwiraza.medianewsonline.com/income_tax_appellate_tribunal_rules.pdf
    • http://wifunagidoli.mypressonline.com/norcold_refrigerator_not_working_on_electric.pdf
    • http://vomimaforotagi.mywebcommunity.org/14580835785.pdf
    • https://static.s123-cdn-static.com/uploads/4467005/normal_5fcc463f6c245.pdf
    • https://cdn.sqhk.co/sirijunubi/whgZEjd/domino_s_pizza_menu_deals.pdf
    • https://cdn-cms.f-static.net/uploads/4464521/normal_602addbf1050c.pdf
    • http://copalofa.site/rexulatajetofewunxum.pdf
    • http://zegererevez.medianewsonline.com/cdsco_approved_drug_list_2020.pdf
    • https://cdn.sqhk.co/numokafas/jLr7jh0/graphic_design_portfolio_examples.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/migivewuwe/salesforce_lightning_design_system_developer_guide.pdf
    • https://s3.amazonaws.com/vavabi/hants_journal_court_report_november_2019.pdf
    • https://s3.amazonaws.com/musokejixami/dance_monkey_tones_and_i_free.pdf
    • https://s3.amazonaws.com/bupijila/sawanifosifugumi.pdf
    • http://sawurawefivovo.myartsonline.com/the_rational_male_summary.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_off0000f014.bin
08a9d8ef26e2f67a7189844d148fe180c167e2ab1fc2fc8831f947bfe9756fa1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF014 5556 bytes
font_01_sfnt_off000102d1.bin
ac75e642eea5dd5616604868595133e0ba90138e406656782d0d5a6fccec64af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102D1 10424 bytes

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