Malicious PDF — malware analysis report

Static analysis result for SHA-256 acbf45ccde89558b…

MALICIOUS

PDF

82.0 KB Created: 2021-02-25 20:17:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 2064028766a744f00979512d6a1c868a SHA-1: 29393e6638135a20af325c081cd379a1261a248e SHA-256: acbf45ccde89558ba28fe3f5d5e73760edc55b5183bd1715074c0d153c7ccfc5
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect the user to malicious sites, potentially for credential harvesting or further payload delivery.

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://baarspo.ru/award?keyword=officejet+pro+8620+e-all-in-one+printer PDF link annotation
    • https://kazuvamelu.weebly.com/uploads/1/3/0/7/130738637/zapokomewaz.pdfIn PDF document text
    • https://bibatuzasofobi.weebly.com/uploads/1/3/4/8/134879938/setaridubejogonode.pdfIn PDF document text
    • https://zimegusak.weebly.com/uploads/1/3/4/6/134605775/forepizamosijejil.pdfIn PDF document text
    • https://magifoxokepo.weebly.com/uploads/1/3/6/0/136053300/zarujabe.pdfIn PDF document text
    • https://degezumibupupek.weebly.com/uploads/1/3/4/8/134862322/69e1d74b.pdfIn PDF document text
    • https://demutarovawo.weebly.com/uploads/1/3/3/9/133997894/5816912.pdfIn PDF document text
    • https://xidabasexibure.weebly.com/uploads/1/3/1/6/131637276/jeloganufipufov.pdfIn PDF document text
    • https://sesupukaxupasi.weebly.com/uploads/1/3/1/0/131070911/sulufes-sedewanetatufiw-webudimes.pdfIn PDF document text
    • https://salofapaj.weebly.com/uploads/1/3/4/3/134314320/76c29.pdfIn PDF document text
    • https://vizupadugixodu.weebly.com/uploads/1/3/0/8/130813134/0d224cc.pdfIn PDF document text
    • http://vifepixakusuped.iblogger.org/vofupobizeker.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
    • https://s3.amazonaws.com/piwupevivotixi/does_steam_while_playing_games.pdfIn PDF document text
    • https://s3.amazonaws.com/sebunuzu/stihl_backpack_blower_br600_spark_plug.pdfIn PDF document text
    • http://jofiwevamixeta.epizy.com/rogeteginedadoxuwivaruner.pdfIn PDF document text
    • http://wawefib.rf.gd/tisun.pdfIn PDF document text
    • https://s3.amazonaws.com/jafujasiwetid/48059191232.pdfIn PDF document text
    • http://vixugow.epizy.com/aguner_poroshmoni_full_movie.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_off0000f66d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66D 5376 bytes
SHA-256: 8d4017c50e4120997874087f60d8dcb097be2851bd990b664d2ef357c85de832
font_01_sfnt_off000108c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C7 10568 bytes
SHA-256: 5ec3356fb5d43d2fcd51734309561d314351ac1fe3fd7c0d417591c34bb2abf7
font_02_sfnt_off00012cf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF1 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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