Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf3acd325b7fdadc…

MALICIOUS

PDF

69.7 KB Created: 2021-02-21 18:50:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: accc3edba5a7d5d7afdeb6498a3f1cad SHA-1: e706ae27fa342b2e00e795235a37a74b6ab9eba5 SHA-256: cf3acd325b7fdadc0ad8a6071e0711231894331a5a09d16fdd6190bea4f7a922
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a lure for a common search query. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic of using numerous disposable domains to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://jottigo.ru/strik?utm_term=how+to+remove+broken+blade+from+ryobi+reciprocating+saw PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4409395/normal_5fe625637f713.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463792/normal_6027453eb378e.pdfIn PDF document text
    • https://sowekunozo.weebly.com/uploads/1/3/5/3/135321923/wugunupori.pdfIn PDF document text
    • https://jabekidedur.weebly.com/uploads/1/3/1/6/131636775/6852825.pdfIn PDF document text
    • https://vasinurevesodux.weebly.com/uploads/1/3/4/6/134605286/7520812.pdfIn PDF document text
    • http://thecaffeinatedstudent.com/zozularenikyygo.pdfIn PDF document text
    • http://organicnu.info/tcl_roku_tv_50_inche7xij.pdfIn PDF document text
    • https://sesoramin.weebly.com/uploads/1/3/2/6/132681885/ed3b201.pdfIn PDF document text
    • http://bezigex.iblogger.org/mezudedowus.pdfIn PDF document text
    • http://sodaapp.pro/94407263983p1og8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370547/normal_60293e49cc3fd.pdfIn PDF document text
    • http://bluebadgeform.com/yep_120a_programmingxch5r.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412394/normal_601d364ab8387.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/extenuating_circumstances_form_university_of_essex.pdfIn PDF document text
    • https://s3.amazonaws.com/fekife/adulterants_in_food_chemistry_project.pdfIn PDF document text
    • http://xovanixavujanu.epizy.com/liwiwosejapasajum.pdfIn PDF document text
    • https://s3.amazonaws.com/megujobemegor/burglar_alarm_written_project_report.pdfIn PDF document text
    • https://s3.amazonaws.com/lofese/scaricare_canzoniere_chitarra.pdfIn PDF document text
    • https://s3.amazonaws.com/daniwodug/tj_maxx_australia_routing_guide.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_off0000d209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD209 5892 bytes
SHA-256: f3d1ea55fb8a58e70fe37c7b72c861083b6fd0a4a0b9ac162ff8ed555764a9c7
font_01_sfnt_off0000e621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE621 10300 bytes
SHA-256: 046f18bd5109d79cd5fcd335f33309eb8387d2a4154908d227f02eee7c944002

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