Malicious PDF — malware analysis report

Static analysis result for SHA-256 c71c9b077a874e41…

MALICIOUS

PDF

115.3 KB Created: 2020-12-24 00:02:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ad77ae3be311439e9aa9ce2e16b8be1a SHA-1: 970f71c1bc98741fbfa5244509b0760964e97fd1 SHA-256: c71c9b077a874e4132500eb3beeefd8b4cf2f0e7b42e29e3ce776dfb41f5c8ef
104 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by multiple heuristics and a machine learning classifier. It contains embedded URLs, one of which, 'https://trafffe.ru/123?utm_term=fda+1572+instructions', is flagged as a potential phishing lure. The document body, though heavily obfuscated, contains text suggesting it is an invoice or payment instruction, aligning with the SE_INVOICE_LURE heuristic. No scripts were extracted, but the presence of external links and the phishing lure strongly suggest a social engineering attack.

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
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://trafffe.ru/123?utm_term=fda+1572+instructions
    • https://cdn.sqhk.co/telupiza/QlUhcrB/globe_at_home_application.pdf
    • https://cdn.sqhk.co/pegebatanuz/hyDjjhd/the_oregon_trail_american_settler_mod_apk.pdf
    • https://cdn.sqhk.co/weteroliwo/e9fiiji/sasopipifalajebebon.pdf
    • https://cdn.sqhk.co/duwewofowus/dijuuhb/70374864290.pdf
    • https://cdn.sqhk.co/pujunuzivas/RDukbfW/43082857315.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f8319dd3-5d9a-44dc-ad17-6b7e14c6dc8e/sketchup_deneme_srm.pdf
    • https://uploads.strikinglycdn.com/files/4594c6ac-a1a2-41b1-9aa5-34e23a4cbc62/ruzape.pdf
    • https://uploads.strikinglycdn.com/files/be13095e-1b70-4076-8f2f-5911294c1a7f/42229615847.pdf
    • https://uploads.strikinglycdn.com/files/dc2e165a-a5f5-407a-a80d-6eae5a6c3c9d/71782118064.pdf
    • https://uploads.strikinglycdn.com/files/6eaced60-bd47-426d-9090-78c2ad5f1b6e/serum_plugin_manual.pdf
    • https://uploads.strikinglycdn.com/files/d54d772c-3905-4846-9a8d-150769f2ea75/66208024538.pdf
    • https://uploads.strikinglycdn.com/files/96b10bb6-ce6c-4fd6-93f8-fefa91e1a65c/95127904551.pdf
    • https://uploads.strikinglycdn.com/files/6d78bd6b-2fe4-4f81-ad2d-28f4e552d3e8/modufuribumatotelelebowi.pdf
    • https://uploads.strikinglycdn.com/files/c8ca72fd-15d4-4a3d-a1e6-d992d3df4ca3/34962518783.pdf
    • https://uploads.strikinglycdn.com/files/79b1f27d-cb4a-4330-aa9c-9d8450ce9034/tsm_4_beginners_guide.pdf
    • https://uploads.strikinglycdn.com/files/4b6b8120-c5cb-4186-8117-d70ee7e8640b/midlothian_high_school_va_reviews.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_off0001854d.bin
34847483f77f4712a53f9f7f714f20061440062a1fd6620af8d3fb63972a2ce2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1854D 5244 bytes
font_01_sfnt_off0001973e.bin
fcff5db81bd1a3f483b759212885c902e43042527d6db4805c41fb39f8c9f3e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1973E 11592 bytes

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