Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3b3248772b575b4…

MALICIOUS

PDF

76.6 KB Created: 2021-02-26 04:38:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: fab54e962d3e3171e9b530c6dd0682e8 SHA-1: aa907ff4e6e3b4938cf0702ffe6f0a0cc9950e25 SHA-256: c3b3248772b575b44e0e0bbe00958819e808ad22d2c11a7df5f603c1081feb33
166 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Numerous embedded URLs, many pointing to disposable domains or link farms, suggest a phishing or malware distribution attempt. The presence of 'powershellt02gw.pdf' in the document text and a heuristic firing for 'LOLBin token sequence' indicates potential execution of malicious scripts, likely JavaScript given the PDF context.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://leonvi.ru/wix?keyword=human+respiratory+system+worksheet PDF link annotation
    • https://cdn.sqhk.co/vumuwuxa/aTzvzbU/adventure_communist_wiki_new_atlantis.pdfIn PDF document text
    • http://lovemecompletely.com/office_365_proplus_activation_report_powershellt02gw.pdfIn PDF document text
    • http://monoga.space/the_lost_spires_downloadux0yl.pdfIn macro / runtime command snippet
    • https://cdn.sqhk.co/rifokinimito/iieibgh/cruise_travel_agent_jobs_near_me.pdfIn macro / runtime command snippet
    • http://lnstagram-badge-verification.com/nifezaxabonijimuxojezunh84p.pdfIn PDF document text
    • http://instasurprise.online/lonugabozeud5ps.pdfIn PDF document text
    • https://cdn.sqhk.co/rutisifelom/iZ5VM7E/checklist_approach_cfa.pdfIn PDF document text
    • https://cdn.sqhk.co/bapisolel/jgHheGQ/85037981354.pdfIn PDF document text
    • https://cdn.sqhk.co/tamejenonisi/jqjdTgi/archero_best_rune_stats.pdfIn PDF document text
    • http://pofuxubilet.sportsontheweb.net/navubuxekusi.pdfIn PDF document text
    • http://bcpzonasegura10beta-viabcp.com/talijanski_jezik_gramatikavb5gk.pdfIn PDF document text
    • https://cdn.sqhk.co/vebiziwob/5XjhpRE/xebeduxemoriru.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jojudodadanu.epizy.com/minority_report_2002_imdb.pdfIn PDF document text
    • http://kepofif.onlinewebshop.net/tulajolinojonusi.pdfIn PDF document text
    • http://suzogoga.epizy.com/pobazajevuboxelat.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://jojudodadanu.epizy.com/minority_rIn macro / runtime command snippet
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6E 5244 bytes
SHA-256: 977d6a12d831781625db3f40099004a8c9675d15e2c10bb00d8183013f943194
font_01_sfnt_off00010124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10124 10688 bytes
SHA-256: 3bc65c4cb5d993d13659796ea685368119d0290503cd6b9f4195b0e5e760810c

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