Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb5fadb7537da684…

MALICIOUS

PDF

92.0 KB Created: 2021-04-12 06:48:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 72288306b5e63db0ee06fc3c1b7c8956 SHA-1: ec288ae1d9c03046eaf127dec80c4db3d0b1d0ea SHA-256: cb5fadb7537da684bfdb7dda00658be0996c1972b037b7edefa248b32724fb6d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://jacksth.ru/strik?utm_term=starcraft+2+protoss+units+2019 PDF link annotation
    • https://cdn.sqhk.co/kefofepobam/7iiheii/translate_english_to_nihongo_words.pdfIn PDF document text
    • http://odemebayisitrafik.com/anatomie_de_l_oreille_externeyc23j.pdfIn PDF document text
    • https://jokasagumejede.weebly.com/uploads/1/3/1/0/131070006/talimuta_mojukekevaz_sexixivudaguk.pdfIn PDF document text
    • https://dobisuji.weebly.com/uploads/1/3/1/4/131454523/zumepalefilegi.pdfIn PDF document text
    • http://fasodotujane.iblogger.org/mojusudisexa.pdfIn PDF document text
    • https://cdn.sqhk.co/vefemenivu/fSghIsC/heart_problems_after_covid_infection.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369651/normal_6042234730ebf.pdfIn PDF document text
    • https://wafanipo.weebly.com/uploads/1/3/2/6/132695839/7654748.pdfIn PDF document text
    • https://suzavopuwo.weebly.com/uploads/1/3/4/6/134686694/nuxanevolamup.pdfIn PDF document text
    • http://fortuneo.biz/rinepafodijc51u.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379489/normal_6003c1a7023b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393204/normal_60365a0bc1fca.pdfIn PDF document text
    • http://idealica-columbia.site/sial_exhibitor_listr99jj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460688/normal_603cadcf63527.pdfIn PDF document text
    • https://cdn.sqhk.co/zevijevam/icjcgio/red_herring_fallacy_ads.pdfIn PDF document text
    • http://wasumukidote.iblogger.org/zurumudobajof.pdfIn PDF document text
    • https://cdn.sqhk.co/migukosodaza/Bc3Qeia/29754538683.pdfIn PDF document text
    • http://voirly.xyz/bangalore_to_chennai_shatabdi_platform1xjgq.pdfIn PDF document text
    • https://cdn.sqhk.co/rubupidorinu/gghcife/92421840361.pdfIn PDF document text
    • https://wudizabilizone.weebly.com/uploads/1/3/4/7/134745746/6bcbb5a1b75c6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gamujid.epizy.com/93814640023.pdfIn PDF document text
    • http://sajutab.rf.gd/approach_to_chest_pain.pdfIn PDF document text
    • https://s3.amazonaws.com/sewamos/forms_of_address_in_spanish_informal.pdfIn PDF document text
    • http://niwidugugonov.rf.gd/delta_crib_conversion_kit_to_full_bed.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/how_to_test_kidde_nighthawk_carbon_monoxide_alarm.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_off000128d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D4 5564 bytes
SHA-256: 72004d9834e0c3a2309af2ca0aa152315f00e8ac7962b23c092ae118a97aff06
font_01_sfnt_off00013bd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BD4 11520 bytes
SHA-256: 8875c73bc1269b84312bb8bf434807ef4469d2a6ac87ce2a69690e6decd15fcc

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