Malicious PDF — malware analysis report

Static analysis result for SHA-256 b12bcc1490a17b94…

MALICIOUS

PDF

73.7 KB Created: 2021-03-03 20:26:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: aa92a22ff210f41d0c97693a5a241632 SHA-1: 29c7b3ca503bf53bf3b7e8f42a5552535e68fbb9 SHA-256: b12bcc1490a17b949640e49042d3620f2d86c4de3a93d97df30efd20721aac56
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, likely as part of a phishing or malware delivery campaign.

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://nipisod.ru/strik?utm_term=how+to+fix+a+stapler+spring PDF link annotation
    • http://7gusevshop.website/my_talking_tom_friends_download_hackty82f.pdfIn PDF document text
    • http://gtomishebs.xyz/2004_honda_odyssey_transmission_fluid0ds1d.pdfIn PDF document text
    • https://pudasebedizut.weebly.com/uploads/1/3/4/5/134587980/61a6bbe18fb.pdfIn PDF document text
    • http://olymptrade.buzz/do_you_go_to_jail_if_you_roll_3_doubles_in_monopolye9vtz.pdfIn PDF document text
    • https://zokelafeg.weebly.com/uploads/1/3/4/8/134889419/pududafagimab.pdfIn PDF document text
    • http://trastenmyqort.online/25216937661grmh7.pdfIn PDF document text
    • https://wesonibisizigoj.weebly.com/uploads/1/3/0/9/130969529/piziv.pdfIn PDF document text
    • http://rukozhop-guide.com/amantes_del_desiertozirhp.pdfIn PDF document text
    • http://goldstein.berlin/eva_streaming_vostfrutp1d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://sujetokotew.rf.gd/12761923301.pdfIn PDF document text
    • http://kebafitesulodu.epizy.com/sevebuvesunavupaxizi.pdfIn PDF document text
    • http://kolenexe.epizy.com/akhiyan_ch_tu_vasda_song_free.pdfIn PDF document text
    • http://patikogoxuxit.epizy.com/19132408820.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d84a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84A 4976 bytes
SHA-256: 8d42cde08ce1d178cafa4fa1cbfe464608d85fa6c2aa6c98b0cd4a0730cc3fe3
font_01_sfnt_off0000e955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE955 10176 bytes
SHA-256: bcb4cf8ce0180ef1da8e86be73f2510a10a7061b18740c9386d7b8635871b80a
font_02_sfnt_off00010c33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C33 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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