Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6af81b0e4b976be…

MALICIOUS

PDF

77.8 KB Created: 2021-03-25 09:11:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9de93546e333187127e359d9e97a874 SHA-1: 74dde6f88f8817b9a9d860194d54dadb7b51cefe SHA-256: c6af81b0e4b976be7fda704e3b6ff7b3c73e6cb9280d5e811b8e68ffcf60809b
96 Risk Score

Malware Insights

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

The file is a PDF with a high ML classifier score and ClamAV detection, indicating malicious intent. It contains an embedded URI pointing to 'bologen.ru', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to 'Anatomy and physiology of human brain pdf'. No scripts were extracted, but the presence of external URIs and the overall malicious classification strongly suggest an attack pattern involving user interaction with a malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://bologen.ru/award?keyword=anatomy+and+physiology+of+human+brain+pdf
    • http://birobupalojasux.iblogger.org/41064557546.pdf
    • http://shtangennstutkupitseychas.xyz/dillon_650_modifications8x82i.pdf
    • https://cdn-cms.f-static.net/uploads/4484807/normal_60450ef06838e.pdf
    • http://frut-tree.site/20978460330bay24.pdf
    • http://varietystore.website/harry_potter_tale_of_the_three_brothers_scriptf7y7d.pdf
    • https://cdn-cms.f-static.net/uploads/4408186/normal_603095f990713.pdf
    • http://tirudibemaj.22web.org/android_tv_9_features.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2ae8fa2d-8b21-4cd7-bd94-b44763fb9b4d.filesusr.com/ugd/8e1ec7_ab49e5fd8eba4402ae6151fa8c6ec111.pdf?index=true
    • https://598a1783-db1d-4ebb-96f5-d3ad23e1e090.filesusr.com/ugd/ae99eb_24be74f5a268435cb9cbd32de4e1ddff.pdf?index=true
    • http://jazajebexixe.epizy.com/suwebififuxetetofararimu.pdf
    • https://uploads.strikinglycdn.com/files/8d6de98e-8f49-48d2-bd5c-bd27e8f8abf0/promo_heat_press_not_heating_up.pdf
    • http://futepukunodur.rf.gd/n1_electrical_trade_theory_book_free_download.pdf
    • http://mafofeguf.epizy.com/anais_nin_little_birds_download.pdf
    • http://kirogebi.epizy.com/rifekidagixegav.pdf
    • https://uploads.strikinglycdn.com/files/394d52c8-766f-4d2e-8f58-889b224ee63a/3rd_grade_writing_book.pdf
    • http://fururebinupi.epizy.com/fudota.pdf
    • https://0b7b936c-93ac-4a60-9644-6ba220b934cc.filesusr.com/ugd/b4bf80_1bb35a84c0be4ff39a86662401584fd6.pdf?index=true
    • http://tolimimagag.epizy.com/2664222072.pdf
    • https://uploads.strikinglycdn.com/files/7bf86dcb-f398-4600-82bb-452ad8cf8a19/hieroglyphics_translator_typewriter.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_off0000f21f.bin
abe32d409aba0cae93f08c4250c17d1bd2dacde2c3dbd14640c17d10a03fffd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF21F 5688 bytes
font_01_sfnt_off00010558.bin
8bfadb11c07554e5fe4874259bdb6cc6096ffc83a125a73bc471c1361927831c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10558 10812 bytes

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