Malicious PDF — malware analysis report

Static analysis result for SHA-256 10c236b8cbe79547…

MALICIOUS

PDF

63.3 KB Created: 2020-11-24 20:22:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 677aa83ea161d36206f9a65149ed6bdc SHA-1: 1f55cf5c0c082ea85fe70b8056d5a7754f5fe24a SHA-256: 10c236b8cbe79547531de16dd6aa39786567bac6f092c27e35e60ea7144b8768
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. One prominent URL, 'https://trafffe.ru/strik?utm_term=forgive+and+forget+book+pdf', is flagged as suspicious and likely leads to a phishing or malware distribution site. The document body, though heavily obfuscated, contains text related to 'book pdf' and authoring application details, suggesting a lure to download content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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/strik?utm_term=forgive+and+forget+book+pdf
    • https://wifivufadabigo.weebly.com/uploads/1/3/4/5/134522009/ligafizumunokoter.pdf
    • https://duzufekiwavana.weebly.com/uploads/1/3/4/6/134609718/vexipapifaligog.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/26db2e17-1570-40fc-b29a-c69d9168cd57/fx_animation_classlife.pdf
    • https://uploads.strikinglycdn.com/files/dbfcf7b3-2758-4c18-84d7-f814fbd9f18b/9274031013.pdf
    • https://s3.amazonaws.com/mibiwivanetuj/26502222320.pdf
    • https://s3.amazonaws.com/tonemakopinibem/41111852116.pdf
    • https://uploads.strikinglycdn.com/files/ed1db68e-e5f6-4b63-9450-ea21945bac7a/mexugigebobabinijovebod.pdf
    • https://s3.amazonaws.com/kepevipawit/examples_of_morally_ambiguous_characters.pdf
    • https://uploads.strikinglycdn.com/files/44f666e8-aa1f-4f15-8d11-0dba59d5da84/elite_dangerous_mining_guide_beta.pdf
    • https://uploads.strikinglycdn.com/files/32b8d639-8784-4925-8055-627e9f5645d1/the_first_90_days_full_book.pdf
    • https://uploads.strikinglycdn.com/files/dba19e1d-7e1f-431a-8106-766e53600827/tajomo.pdf
    • https://uploads.strikinglycdn.com/files/c2b3cdaf-33bf-4a67-8a33-65ab4bdc06dd/gesudedepedadumevi.pdf
    • https://s3.amazonaws.com/xanebavifamopez/wing_chun_fighting_techniques.pdf
    • https://uploads.strikinglycdn.com/files/572d38db-831e-41e4-9b82-33a54e1a948e/fizaki.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_off0000ba7d.bin
8d3a155f982dc9360f221e5ae1bc0877f14a76d0c4e15fccd9d1d27e7fa5d071		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA7D 5216 bytes
font_01_sfnt_off0000cc5a.bin
cd291eb635730b442d9aafe0210eb0c882c9be84eaf767e2304b17f3d0ae8939		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC5A 10532 bytes

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