Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd5ca31d97b3e88c…

MALICIOUS

PDF

72.3 KB Created: 2021-01-25 16:50:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: aac69bdc9257b7babc519bd1c594018e SHA-1: e158366c24ef5e315e3a6ca9bbecbe446156cdbb SHA-256: fd5ca31d97b3e88ccb0e4ad74c0b27d26b9ea39e03282e38bc236d330dff07a7
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, including one that redirects via a 'utm_term' parameter, suggesting a phishing or malware distribution lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating the PDF is part of a link farm on disposable hosting, likely to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://seumenha.ru/aws?utm_term=breakdown+maintenance+report+format PDF link annotation
    • http://pubgmobiie.com/66680725492bnsah.pdfIn PDF document text
    • https://cdn.sqhk.co/genopeno/jenNwzR/sotakolafek.pdfIn PDF document text
    • https://zabaruwizugode.weebly.com/uploads/1/3/4/5/134596412/tidugu.pdfIn PDF document text
    • https://fovozipi.weebly.com/uploads/1/3/0/7/130775458/winedusovebewar-pokupaje-kaxik-luzawopigez.pdfIn PDF document text
    • https://cdn.sqhk.co/puroneruk/gcAgikp/csulb_business_management_major_requirements.pdfIn PDF document text
    • https://pekedepak.weebly.com/uploads/1/3/5/3/135399439/wajiroxivipi.pdfIn PDF document text
    • http://shoplus.info/xiroximiborijonixapiq84ze.pdfIn PDF document text
    • https://beteviduzil.weebly.com/uploads/1/3/3/9/133986260/pinefumubiji.pdfIn PDF document text
    • https://vimanofadubob.weebly.com/uploads/1/3/5/3/135304206/3cc7c.pdfIn PDF document text
    • http://klokisik.space/find_my_friends_reporting_wrong_location6cd4p.pdfIn PDF document text
    • https://cdn.sqhk.co/jigavozef/v4jchci/super_helix_jump_hack.pdfIn PDF document text
    • https://cdn.sqhk.co/bedazume/hbjchcQ/greatest_hits_songs_queen.pdfIn PDF document text
    • https://cdn.sqhk.co/suzironanes/ajdhbDp/subway_idle_unlimited_money.pdfIn PDF document text
    • http://unityfree.xyz/king_azariah_in_the_biblegy74f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xalexojaxipud/vimeo._com_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/sowirutelevolur/calm_music_audio.pdfIn PDF document text
    • https://s3.amazonaws.com/tozaduliwubega/11828348335.pdfIn PDF document text
    • https://s3.amazonaws.com/gupawupigawono/aiming_games_on_android.pdfIn PDF document text
    • https://s3.amazonaws.com/jalasilunaz/fawukud.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F6 5296 bytes
SHA-256: ad0acf5594f1d90877b47988d955995586328aa87f318ca385397dfa6e1e4db5
font_01_sfnt_off0000f3fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FB 9308 bytes
SHA-256: 9469423c434f14ecb7f4f3918b4c331b567d9849b6f40921c66431f940f34adb

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