Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0a8e349a91459a7…

MALICIOUS

PDF

71.5 KB Created: 2021-02-23 20:40:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: b7b0c6bc4fca72bff0a9a0efe44d38f6 SHA-1: f70770955d4d8d31598529ec0180ac877d291012 SHA-256: b0a8e349a91459a777c494372f7c4b2be0db7755a1d94481fe543e2ab61d43dc
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. It contains numerous external links, with one heuristic identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and numerous URLs indicate an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/123?utm_term=molecular+and+cellular+biology+impact+factor+2019 PDF link annotation
    • http://fbcopyright-center.com/behringer_xenyx_1204usb_podcast_setupx001k.pdfIn PDF document text
    • http://begetus11ppz.xyz/227442922940hflo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501206/normal_600aaf0e43b27.pdfIn PDF document text
    • https://xirofagoxo.weebly.com/uploads/1/3/4/5/134576207/fuwomalawezuvejew.pdfIn PDF document text
    • http://rameautbxy.space/rounding_4_digit_numbers_to_the_nearest_100_worksheetousvp.pdfIn PDF document text
    • http://miiliioner.xyz/nizipojiziravijoswccbh.pdfIn PDF document text
    • https://fotizewuzawefuv.weebly.com/uploads/1/3/4/6/134668380/3992309.pdfIn PDF document text
    • http://masalev.ru/lg_g_pad_f_8.0_-_4g_ltellq2h.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408004/normal_600bf89297ccb.pdfIn PDF document text
    • https://zopoxetofosifa.weebly.com/uploads/1/3/4/8/134863155/6549943.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pakafadudu.epizy.com/56302982017.pdfIn PDF document text
    • http://bifikaximeme.epizy.com/zumomebizupusopi.pdfIn PDF document text
    • http://pelubameta.epizy.com/71334719050.pdfIn PDF document text
    • http://rivelik.epizy.com/how_to_clean_a_hoover_steam_vac.pdfIn PDF document text
    • http://zupotid.epizy.com/knight_rider_music_sheet.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_off0000d4b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B5 6024 bytes
SHA-256: 8f2868d6d7d722aed60baf5bac32a8808e3b5f355fee2e407686b3555aa99e7d
font_01_sfnt_off0000e940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE940 11864 bytes
SHA-256: fa273e471d62f2e0037ea530e896ee6de455dafb4a558c2b5efd49e6277767b1

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