Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a0d1bf813dca8ad…

MALICIOUS

PDF

101.7 KB Created: 2021-02-23 22:19:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 6407c26cefc6af81c61013ba08e03583 SHA-1: 0fddb65f00fc48fd4c28f10386f667dc97e4dfa3 SHA-256: 4a0d1bf813dca8ad7422e269f2b2923f03e7117985e07d3f5e9a02beff74f8dd
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as an SEO link farm and a high-confidence heuristic flagging it as an image lure linking to an SEO redirector. The primary malicious URL identified is https://bologen.ru/wix?keyword=tenko+shimura+meaning, which is likely used to redirect users to a phishing or malware distribution site. ClamAV also detected this file as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/wix?keyword=tenko+shimura+meaning PDF link annotation
    • https://lujinelux.weebly.com/uploads/1/3/4/3/134361227/sosifonuse.pdfIn PDF document text
    • https://cdn.sqhk.co/lusikagidet/6NjiSjg/13956279675.pdfIn PDF document text
    • https://cdn.sqhk.co/fukonovum/gce5haT/cat_running_around_frantically.pdfIn PDF document text
    • https://vazonani.weebly.com/uploads/1/3/1/8/131871537/feguvijoparal.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464056/normal_6001d163e10f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382420/normal_5fe6b2eeaff9c.pdfIn PDF document text
    • https://cdn.sqhk.co/tetaxekumipi/UbGibha/buxosulegeroj.pdfIn PDF document text
    • https://bosonelete.weebly.com/uploads/1/3/0/8/130873804/5125a43.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469634/normal_5fc8c28c89b75.pdfIn PDF document text
    • https://cdn.sqhk.co/bavimimo/gcjghib/snake_plant_light_bulb.pdfIn PDF document text
    • https://ralanuda.weebly.com/uploads/1/3/0/7/130775203/kamijirugomivenamo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455195/normal_6022927c03e83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366661/normal_6017db5fce492.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/kevava/community_service_reflection_report.pdfIn PDF document text
    • https://s3.amazonaws.com/juzewojavomofew/9037424457.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/17816416140.pdfIn PDF document text
    • https://s3.amazonaws.com/zizene/acer_aspire_one_notebook_drivers.pdfIn PDF document text
    • https://s3.amazonaws.com/wujodibu/blender_animation_software_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/tirimofufemukat/tv_line_guide_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/savukojubusum/nizusarigupopadojexek.pdfIn PDF document text
    • https://s3.amazonaws.com/rekawexuretowo/46832843378.pdfIn PDF document text
    • https://s3.amazonaws.com/lekelepowo/86145132334.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011dc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC4 16944 bytes
SHA-256: 8c61472a9116c3a8775fa979c145afff21f417ae03b4206510cd72e9077c80ce
font_01_sfnt_off00015457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15457 5080 bytes
SHA-256: 7d45676d3e3eee07d0aac15f73ea91d18c7233e798b495c2b9bff5e6ef1d1759
font_02_sfnt_off00016570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16570 10420 bytes
SHA-256: de1d4df57d0bf0bc0b534d3c4612e3a3a7de7f1e1c03a83b5a45d45b9ce8cd0e