Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc2332ffba582d50…

MALICIOUS

PDF

77.3 KB Created: 2021-03-28 15:35:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 0d65c378440c10f713fcfbc8a49a9c13 SHA-1: 4d9d27ab411f670a487985c0aeaddfaeb170bbf3 SHA-256: bc2332ffba582d50df30ebc5975d8af74d2f56304bae4af97433dab7fc9ce29c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and the presence of external links suggest it's designed to lure users to malicious sites, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://druttle.ru/strik?utm_term=oracle+sql+vs+ms+sql+syntax PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4410965/normal_5fe3e81b5a547.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474206/normal_600115f320d59.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465128/normal_5fca7504d8f16.pdfIn PDF document text
    • http://vuxijagodoku.22web.org/xidulugogar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421040/normal_604d791f758d5.pdfIn PDF document text
    • http://fanogizakelime.iblogger.org/21761989046.pdfIn PDF document text
    • http://fonagifegelu.iblogger.org/93218537365.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367920/normal_6032ef251ea88.pdfIn PDF document text
    • http://jaraxusej.iblogger.org/ironbound_proto-_drake_mount_guide.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://botibaxar.rf.gd/contemporary_leadership_styles.pdfIn PDF document text
    • http://bodotekufuw.rf.gd/highway_400_accident_report.pdfIn PDF document text
    • https://9aef9be9-4304-4ec6-b02b-ded1eabc5d1b.filesusr.com/ugd/a571b8_198692b1e28044809282544d3909eb9a.pdf?index=trueIn PDF document text
    • http://falufobi.epizy.com/chaos_tamil_dubbed_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/b._com_4th_sem_syllabus.pdfIn PDF document text
    • https://6a24fdd2-d4a5-4c4b-882b-0f3115751bcf.filesusr.com/ugd/04e6f9_b132f65dca504b96bcf068250f183a44.pdf?index=trueIn PDF document text
    • http://gosiribe.epizy.com/408310450.pdfIn PDF document text
    • http://tojederetesez.epizy.com/cat_meme_template_origin.pdfIn PDF document text
    • https://30d6ba4c-d201-4e26-8f31-a0e059b28788.filesusr.com/ugd/f9b8bb_a15224cb0fc4432aa7d826fc267db34a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mivokozibu/introduction_to_heat_transfer_6th_edition_bergman.pdfIn PDF document text
    • http://zelalosiker.rf.gd/fe_electrical_engineering_review_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/kasuwevovog/70623904856.pdfIn PDF document text
    • http://bedevekozazabe.rf.gd/american_pie_8_movie_in_tamil.pdfIn PDF document text
    • http://kevikawimal.epizy.com/74048336417.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_off0000f103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF103 5328 bytes
SHA-256: 103ad0b92c8b0256b362fadcc36ba7048dc0e2342e143ade31effc96ac92ab26
font_01_sfnt_off0001031d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031D 10884 bytes
SHA-256: 98c2509e196a66288f9d5d43375592e9a0bcb0438bde15352bcb65f206c63fe8

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