Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b7a281c7accec1e…

MALICIOUS

PDF

85.5 KB Created: 2021-04-18 04:16:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: e41f49158a82ff39172552fbd70156cf SHA-1: ea97d4d717f66bafe4657803215dc636c394a4e6 SHA-256: 8b7a281c7accec1eb0116836efe5675c413c573eb0f3572a1b4871c9072f92af
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious PDF lures.

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://resalured.ru/strik?utm_term=huckleberry+finn+quotes+about+friendship PDF link annotation
    • http://likefetevu.getenjoyment.net/dovegikateke.pdfIn PDF document text
    • https://cdn.sqhk.co/kusonemap/mgiFvhQ/sexubage.pdfIn PDF document text
    • https://cdn.sqhk.co/ninulekuto/Hhejebx/vehicle_tax_calculator_california.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450151/normal_605bef5a37678.pdfIn PDF document text
    • https://cdn.sqhk.co/libegavezu/V0ioien/akeyla_mahanayak_movie.pdfIn PDF document text
    • https://cdn.sqhk.co/dogilijesiwu/vfMZ2ja/beautiful_script_fonts_for_tattoos.pdfIn PDF document text
    • http://veselutut.mywebcommunity.org/87190224020.pdfIn PDF document text
    • https://cdn.sqhk.co/nebinefis/ajjuheg/world_championship_cycling_2019_live.pdfIn PDF document text
    • https://cdn.sqhk.co/ritapabinap/5FMZWZ9/24892639076.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374022/normal_601d210460549.pdfIn PDF document text
    • http://dujojiwasemob.mywebcommunity.org/12_math_rules_that_expire_in_the_middle_grades.pdfIn PDF document text
    • http://govuled.mywebcommunity.org/modify_text_free_online.pdfIn PDF document text
    • http://wumiwuzigimo.mywebcommunity.org/brunner_and_suddarth_15th_edition.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1cc55b0-5140-41fa-beac-894a522fc7aa/washington_dc_map_white_house.pdfIn PDF document text
    • https://ed7c5604-ec0f-4ae6-9d22-6d534b57d154.filesusr.com/ugd/1d5a3f_d2a784b63bd54d5e8c3889d3b92dc85d.pdf?index=trueIn PDF document text
    • https://6cf80756-66c2-4d2e-b15d-ff1677cb7115.filesusr.com/ugd/2257e8_a18f2721f0134ae9996aee5db91f7cb0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d97729f3-febe-41d0-a3e9-453edf0bedda/vapisizipajudobat.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_off000110a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A6 5636 bytes
SHA-256: 6510d573f45abb2f72ed62c9882079f3ff82933e2d94045208f929ba3315d31a
font_01_sfnt_off000123cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123CC 10812 bytes
SHA-256: 2095bda9e5422088c55b636480089fe4c7e39993fc8a88bfa5d4b1524c09b595

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