Malicious PDF — malware analysis report

Static analysis result for SHA-256 94143f4cfc548a55…

MALICIOUS

PDF

160.8 KB Created: 2021-05-28 21:09:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: dcb15cdde748829ff1f21bbe52374377 SHA-1: c65adf70a72c09b4f71ae46038305b842b837891 SHA-256: 94143f4cfc548a55a0c985d4e09051b9bc4091f82f4bc9ac492513f267620aee
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to disposable hosting services and link farms, suggesting it's designed to redirect users to potentially harmful sites. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly support a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/123?utm_term=argentina+uruguay+copa+america+2011+formaciones PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369302/normal_603801c81ed6b.pdfIn PDF document text
    • https://gedorizifoxe.weebly.com/uploads/1/3/1/6/131607240/wujedo_ropeb_mezebevebozimon_fenagobemuvok.pdfIn PDF document text
    • https://nidozasa.weebly.com/uploads/1/3/4/6/134680612/xalugaputunur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387819/normal_604564bca61ef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366348/normal_5ff34a1b77cc8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383136/normal_5fc6c708c9bee.pdfIn PDF document text
    • https://pazonijozofax.weebly.com/uploads/1/3/1/6/131606668/4b8e6ba5bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463552/normal_5fe6d613e9d8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467322/normal_600e50d4112b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419194/normal_60566ad7a1409.pdfIn PDF document text
    • https://xafarigokexugu.weebly.com/uploads/1/3/6/0/136053206/pugeve.pdfIn PDF document text
    • https://wivewuti.weebly.com/uploads/1/3/4/6/134698804/9669097.pdfIn PDF document text
    • https://baboxubawuxi.weebly.com/uploads/1/3/4/6/134666135/vusimituj.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/fc750c64-0af2-41cf-943c-d611d1ca827b/76539283252.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cca38655-d2b1-492e-b5e6-ac6a819326f4/where_can_i_donate_good_clothes.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_off0002363d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2363D 5720 bytes
SHA-256: 034dd62556cabdea7df97f7e2b7e8ca2f0bfb9c63fb316f4760e48f83cb71bca
font_01_sfnt_off000249be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x249BE 13008 bytes
SHA-256: 6dc064714ed0e2196b5ffcfa3559fea9db473aa6e215051cb4aac809e0198bf9

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