Malicious PDF — malware analysis report

Static analysis result for SHA-256 081d7832c8398d00…

MALICIOUS

PDF

72.3 KB Created: 2021-03-27 14:12:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 737f4fd03522621c7e8f066d39131e44 SHA-1: 7f48bff66b9ba966dac9e9d4bdadce2d144ebcfe SHA-256: 081d7832c8398d00549e899391d2c76eb0935adf57be6b5abaf09cb5c2c2db6c
96 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to 'bologen.ru', which is highly suspicious given the 'malicious' verdict and ClamAV detection. The document body, though heavily obfuscated, suggests a lure related to 'biochemistry 1st year mbbs pdf'. The presence of embedded URLs and the ML classifier's high confidence indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/award?keyword=biochemistry+1st+year+mbbs+pdf
    • http://brosbass.com/luwusomolaguvad10ii.pdf
    • https://kevavabine.weebly.com/uploads/1/3/1/4/131406582/dikowafa-ruderuvapib-majarezituxe-kukipeso.pdf
    • https://rowiteruna.weebly.com/uploads/1/3/4/4/134470704/8123220.pdf
    • https://cdn-cms.f-static.net/uploads/4369329/normal_5fe814a75bd66.pdf
    • http://kittyplay.online/the_full_armour_of_god_bible_verse2luhm.pdf
    • https://cdn-cms.f-static.net/uploads/4369781/normal_5fe83f79a6c4a.pdf
    • http://in-arenas.com/pujevategawazatewafj7ewu.pdf
    • http://ilkertr.shop/universal_remote_codes_for_onn_dvd_playercjjed.pdf
    • https://cdn-cms.f-static.net/uploads/4367916/normal_6027cc4a2b1fe.pdf
    • https://falatunasozenu.weebly.com/uploads/1/3/4/7/134762474/vumifug_pimolufu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tevomenil/vebalazedido.pdf
    • https://uploads.strikinglycdn.com/files/be260c8d-8394-40c7-8569-299f1d48857a/28807734562.pdf
    • https://1e16da7b-5b4f-4122-a3c4-5c88c9d97cf7.filesusr.com/ugd/83f04e_04d0f6a0e8d94be49c82edde1ce1011a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/37f26166-b053-4dd0-b775-83a31ffc97af/zarapegojuzege.pdf
    • https://6a1e2a5f-c456-4288-b9d5-5378f87870fb.filesusr.com/ugd/076fac_4ce20cc560924ff28b1bbe933b0639a8.pdf?index=true
    • https://s3.amazonaws.com/papuja/the_secrets_we_keep_kate_hewitt_synopsis.pdf
    • https://uploads.strikinglycdn.com/files/6e94f349-fc56-4034-8a63-d875fef00101/jadivesamubimi.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_off0000dacb.bin
31bc7c22d0e22825f84cdfc72cc0558e94c541f8f0e685c77f48b1b86df28588
pdf-font-stream PDF embedded font (sfnt) at offset 0xDACB 5708 bytes
font_01_sfnt_off0000ee12.bin
58a14ce3fadcac091935203b2b3335ebe2b1f5685578c3c981109db21f9dd476
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE12 10556 bytes