Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c7c329dcf2782cb…

MALICIOUS

PDF

86.2 KB Created: 2021-04-11 19:14:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 32d277b09a12639916e5ffe94019ac8c SHA-1: de1d3f7a2c9644f798a77881646fd1b3793015e9 SHA-256: 4c7c329dcf2782cb39586a03968eaded1e0d1819c2b2074fba7540bbb1da3f57
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous embedded URLs pointing to external sites, with one heuristic specifically identifying it as a link farm on disposable hosting. The document body, though heavily obfuscated, contains references to product comparisons and application metadata, suggesting a lure to external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://bologen.ru/strik?utm_term=compare+garmin+gps+62s+vs+64s PDF link annotation
    • https://xoselupovogim.weebly.com/uploads/1/3/4/6/134610719/8764657.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417670/normal_6005359eb0d70.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378628/normal_6019699e32bbf.pdfIn PDF document text
    • https://nokifafib.weebly.com/uploads/1/3/4/5/134597692/1470474.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382639/normal_5fcff2fc2575d.pdfIn PDF document text
    • http://vibemezanolex.mypressonline.com/78271191017.pdfIn PDF document text
    • http://jofipifemu.medianewsonline.com/built_to_last_james_collins.pdfIn PDF document text
    • http://tezibif.mygamesonline.org/2011_dodge_avenger_heat_tire_size.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369793/normal_6017b80e95235.pdfIn PDF document text
    • http://befemoxujutebi.22web.org/systems_of_inequalities_word_problems_notes_answers.pdfIn PDF document text
    • http://wotidoteked.mywebcommunity.org/opportunity_cost_examples.pdfIn PDF document text
    • http://gakagebir.mypressonline.com/moxovinibavofubu.pdfIn PDF document text
    • http://kinemulawaw.sportsontheweb.net/kakixukowoje.pdfIn PDF document text
    • http://pililiriniru.mypressonline.com/wonders_of_the_world_book.pdfIn PDF document text
    • http://fukuzowi.sportsontheweb.net/vazurowurivupuborumiti.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lebikur.rf.gd/credit_cooperative_society_bye_laws.pdfIn PDF document text
    • http://fijorolur.myartsonline.com/lelowirejufaj.pdfIn PDF document text
    • http://zigizejifumev.rf.gd/37408870996.pdfIn PDF document text
    • http://nixasosuj.epizy.com/understanding_business_11th_edition_ebook.pdfIn PDF document text
    • http://wamunezufim.rf.gd/gawerevo.pdfIn PDF document text
    • http://pigibotokaper.epizy.com/ralavipozitemenekuzew.pdfIn PDF document text
    • http://tawenaxogiminax.epizy.com/younow_apk_mod.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_off000113cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113CF 5444 bytes
SHA-256: 5c80b090203b98f49c41d3353a7675f7903f6a29b106520760903b7de3554e4d
font_01_sfnt_off00012648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12648 10988 bytes
SHA-256: e353e1b24dd07f557dc1dbf90e4fddc6d7cb2015e95611535dfa8fd05013052d

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