Malicious PDF — malware analysis report

Static analysis result for SHA-256 66c346eba5e7491c…

MALICIOUS

PDF

87.8 KB Created: 2021-03-15 10:41:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5b849593ef22e2c5f121134417cb1609 SHA-1: dfa030ed9ecbfb17cf916efd470bff976628f45b SHA-256: 66c346eba5e7491c19b27f3b1d50f35517027e810152e840ec10b7cb41b80f27
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan-like behavior. The primary attack vector appears to be a link farm technique, where numerous external URLs are embedded within the document, likely leading to malicious sites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xezojetit.ru/strik?utm_term=electric+circuits+analysis+by+nilsson+%2526+riedel+10th+edition+pearson
    • https://cdn.sqhk.co/fowipovoji/ercNji6/10747088621.pdf
    • http://logawedulukudan.mywebcommunity.org/ducane_air_conditioner_age.pdf
    • https://cdn.sqhk.co/zibusisujij/ibEiahc/zipav.pdf
    • http://tomolijoponix.mypressonline.com/basketball_shooting_drills_for_high_school.pdf
    • https://cdn.sqhk.co/fagaxirupunu/ijgintD/begejisukinenural.pdf
    • https://cdn.sqhk.co/xonipavu/6ihabja/68816968362.pdf
    • http://italywow.space/59798252582f8bai.pdf
    • http://zonizubiro.getenjoyment.net/all_ly_words.pdf
    • https://cdn.sqhk.co/tivinarafuvu/LyKjehe/word_puzzle_games.pdf
    • http://somixewavado.sportsontheweb.net/telifajawabipanagiv.pdf
    • http://plusstore.pro/3424974194vdxml.pdf
    • http://lezeninimi.medianewsonline.com/ielts_synonyms_for_words_commonly_used.pdf
    • http://sesesuruko.mypressonline.com/19144917037.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://ba85394b-11ac-4ca4-926b-74ca936c52e1.filesusr.com/ugd/5ccfc8_a4511917f62e4a74a41ff97928994c3e.pdf?index=true
    • https://s3.amazonaws.com/mukut/46942633543.pdf
    • https://s3.amazonaws.com/lumixi/chauvin_arnoux_ca_6460_manual.pdf
    • https://2daccc73-8708-4113-a26a-4f38906335d9.filesusr.com/ugd/f65175_6883a36219594baa92d0fec1cfd9c5a2.pdf?index=true
    • https://s3.amazonaws.com/xijalovelokolep/choices_latest_version_apk.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010aea.bin
6b0c54d1a732d2b8c9cab58093ad447b6c4a159f2fb67c85346f0105c43b9906		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEA 4876 bytes
font_01_sfnt_off00011b8b.bin
c3c5c8a3b12b399258ef118a0df6f0db04eeb6f40099013030af6b46bcaf5473		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8B 12076 bytes
font_02_sfnt_off000143fb.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x143FB 4324 bytes

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