Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0bb3c92fe14688c…

MALICIOUS

PDF

74.5 KB Created: 2021-02-15 10:43:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: cd4f487d51c797743cfa8a565d7f9d60 SHA-1: d3f6fc58cb1d1f4a9a680bd8499d446759efe957 SHA-256: d0bb3c92fe14688cb26619f2815f6128850558b6ab65bbaf7e1305758602c62a
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many pointing to other PDF documents hosted on disposable or SEO-optimized domains. This behavior is characteristic of a link farm designed to distribute malicious content or facilitate phishing attacks. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

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/wb?keyword=amplificador%20fender%20mustang%20i%20v2%2020w PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4418791/normal_5ff2e5ed55348.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369520/normal_600833404688e.pdfIn PDF document text
    • https://nepubodi.weebly.com/uploads/1/3/4/6/134610278/kopixanajirojo-pusezurosotog-rofebonebozuvob-vuwiloxesef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410013/normal_5fd978e34a58c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420765/normal_5fda286c0e1da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468814/normal_601fb71bb9849.pdfIn PDF document text
    • https://famipitep.weebly.com/uploads/1/3/4/3/134355151/nedulewosubam.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456387/normal_5fe2578ddd67b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458838/normal_5fe77999e0e8e.pdfIn PDF document text
    • http://detonic-hypertonie.website/windows_xp_iso_file_download_for_android4j8ca.pdfIn PDF document text
    • https://cdn.sqhk.co/xopuxuvop/hcs2rjb/roblox_promo_codes_generator.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386613/normal_6025647d79257.pdfIn PDF document text
    • http://spain50off.info/30407347191ekob5.pdfIn PDF document text
    • http://italy-small.space/vandenberg_launch_schedule_may_2019fkpqb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://renaxodemebi.rf.gd/wozukepixuleme.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_off0000e3c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C0 5892 bytes
SHA-256: 066470423acf423983c70509359108ef052bdc5fdb2511adbfc83321f17d8c38
font_01_sfnt_off0000f7cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CD 10824 bytes
SHA-256: b8ae3bd2f61f2ff74a5c1de5de35f6627b103a73a7d184388ea2a436bd549896

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