Malicious PDF — malware analysis report

Static analysis result for SHA-256 4654fc46f9f90e7c…

MALICIOUS

PDF

76.9 KB Created: 2021-03-05 17:48:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: e0bef360d1a6edd0607fb5629783aeeb SHA-1: e8fa8d9e849684704f52d2b75c13f410f7fe1860 SHA-256: 4654fc46f9f90e7ce50d3a3c6ea0a33a3e24c9020e5e2acc3abf296118023e89
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to disposable hosting or suspicious domains, indicating a likely phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests a malicious intent to obscure the true destination.

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://pelibifir.ru/strik?utm_term=academic+writing+style+guide+pdf PDF link annotation
    • http://1xbet-football.fun/biomassa_de_banana_verde_beneficiosu0i6k.pdfIn PDF document text
    • http://giocodigital.space/what_is_the_strongest_spirit_in_smashgaafp.pdfIn PDF document text
    • http://iceteas.space/127645846378tmr6.pdfIn PDF document text
    • http://vir-tus.com/the_browder_filessu5r7.pdfIn PDF document text
    • https://rotaxavevun.weebly.com/uploads/1/3/4/8/134884867/9a5b33bd36.pdfIn PDF document text
    • http://jumpfs.space/biruledalijulogewakapr0dli.pdfIn PDF document text
    • http://sibuvre.com/penny_stocks_2021_usardyl5.pdfIn PDF document text
    • http://stopnutristrike.ru/how_to_study_korean_hangul4bfle.pdfIn PDF document text
    • http://timelessdecorum.com/693760927195bitu.pdfIn PDF document text
    • https://bawozumop.weebly.com/uploads/1/3/1/4/131452782/jukekebovuxodixajimi.pdfIn PDF document text
    • https://dobopekajami.weebly.com/uploads/1/3/4/3/134314215/85d9bec4ae.pdfIn PDF document text
    • http://natur-green.fun/amplified_bible_applsapc.pdfIn PDF document text
    • https://lasebotoxuxuxir.weebly.com/uploads/1/3/4/7/134729765/6459e330c1eb6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/34ade714-8648-4107-b3b4-d4e70750d3a9/polaris_magnum_425_4x4_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea4ee609-2b07-412e-91ef-294f7b788eb7/how_to_describe_the_tone_of_a_song.pdfIn PDF document text
    • http://nosifunugiwes.epizy.com/solagojurid.pdfIn PDF document text
    • http://sujemitusosida.epizy.com/2006_bmw_330xi_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/169046be-9bdc-40ec-90b6-8de99a2d5d1d/dungeons_and_dragons_rulebook_5e.pdfIn PDF document text
    • http://dimazobuxijema.epizy.com/blank_kanji_practice_sheets_printable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e93a4504-de6b-4ff6-8d8f-9f19097c6f51/58359124652.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_off0000f09c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09C 5660 bytes
SHA-256: 717776dbf5a81a47db45220fb9dc346f5d96969c2a3464aa9ccac189f6177b3e
font_01_sfnt_off000103e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E7 10180 bytes
SHA-256: fd1777cdf120d2d944b3dbe990b91bd21a728e4066d406cc9f397c60f9cf1153

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