Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc51cb096f0530a7…

MALICIOUS

PDF

72.9 KB Created: 2021-02-22 20:45:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 18fdd5bf92c1096a9fc6426a1657f8fe SHA-1: ea806017659620da7a8fda1c8921109e25202fed SHA-256: bc51cb096f0530a7d017fe992e2bebc79461b3c9568fdb631dc246791ca4672e
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a significant number of external links, many hosted on disposable domains, indicating a link farm designed to direct users to potentially malicious or SEO-abused content. The presence of multiple external URIs and the overall structure strongly suggest a phishing or SEO manipulation tactic.

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://bologen.ru/123?utm_term=how+to+import+audio+files+into+garageband+on+mac PDF link annotation
    • https://zuduloto.weebly.com/uploads/1/3/4/6/134623707/4815908.pdfIn PDF document text
    • https://cdn.sqhk.co/letopoto/uNij8ii/tiptop_audio_mantis_review.pdfIn PDF document text
    • https://zofigaxukinepir.weebly.com/uploads/1/3/4/2/134235574/9418775.pdfIn PDF document text
    • https://cdn.sqhk.co/malevevipali/8yW3Tgg/old_point_national_bank_main_office.pdfIn PDF document text
    • https://tivepikilusu.weebly.com/uploads/1/3/4/7/134759048/viwinipefapiba.pdfIn PDF document text
    • https://cdn.sqhk.co/savunowudob/jwifiYV/wugenosefif.pdfIn PDF document text
    • https://cdn.sqhk.co/punipopi/z5hjmge/gemeku.pdfIn PDF document text
    • https://nunipotewisi.weebly.com/uploads/1/3/4/8/134892443/630fe2ef04b9ef0.pdfIn PDF document text
    • https://cdn.sqhk.co/pasivuzuke/hihSPrs/my_airtel_app_download_for_windows_8_laptop.pdfIn PDF document text
    • https://cdn.sqhk.co/sofilita/ejfnOif/3_blade_ninja_blender.pdfIn PDF document text
    • https://mokovudome.weebly.com/uploads/1/3/4/5/134598928/c98069cc5c3ac9.pdfIn PDF document text
    • https://vinosubolab.weebly.com/uploads/1/3/5/3/135316207/10e089.pdfIn PDF document text
    • https://cdn.sqhk.co/xufojidaju/YJXYibA/2_player_race_car_games_ps4.pdfIn PDF document text
    • https://dafavazama.weebly.com/uploads/1/3/4/8/134893815/wibovapunozigud.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/xuzakob/brother_mfc_6490_ink_cartridges.pdfIn PDF document text
    • https://s3.amazonaws.com/getizar/corpse_party_bad_ending_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xupizewuxere/39142868852.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_off0000df59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF59 5668 bytes
SHA-256: 419614d7aba1a96a1f374bbc21c5846a26c931c97c6d66ce1088c6458cf71bd5
font_01_sfnt_off0000f297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF297 10432 bytes
SHA-256: b500aca7d046e6eede6f14399e2416763f4461e777df1dd7c746c1874acb0a93

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