Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b9e7561cad6b1e1…

MALICIOUS

PDF

81.0 KB Created: 2021-05-30 04:36:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 100361607f8dfee2a62a6f2355f12b72 SHA-1: 6241d54a50facf496dfb6ec9de9e0e10aedeeff1 SHA-256: 3b9e7561cad6b1e1bae7af9af6de71ca4fca4b919f4ee5a40da068f13f28b7fb
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links pointing to disposable domains, a common tactic for SEO manipulation or distributing malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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.
  • 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://vilenefex.ru/123?utm_term=symbiotic+relationships+worksheet+high+school
    • https://numibogag.weebly.com/uploads/1/3/4/3/134323011/xuguxobazorurex.pdf
    • https://static.s123-cdn-static.com/uploads/4453889/normal_5febeceb4b6d2.pdf
    • https://xilaperuzu.weebly.com/uploads/1/3/4/3/134362480/14174e7c7a.pdf
    • https://tevufipe.weebly.com/uploads/1/3/1/6/131606546/xupuvoruwesexom.pdf
    • https://vufepuxo.weebly.com/uploads/1/3/4/5/134522835/2d6e91d2a17c5.pdf
    • https://fuxaxogajumuw.weebly.com/uploads/1/3/1/4/131406658/fixebibuxadito.pdf
    • https://fudiribaka.weebly.com/uploads/1/3/4/7/134714876/7817962.pdf
    • https://xavoxoxuda.weebly.com/uploads/1/3/1/3/131379246/kageredinonuvurilew.pdf
    • https://govobozof.weebly.com/uploads/1/3/5/3/135315692/69e98.pdf
    • https://raxasowofano.weebly.com/uploads/1/3/2/6/132681821/vebutagasi-sugufoxe.pdf
    • https://xonalofogikovor.weebly.com/uploads/1/3/4/3/134372302/nijoserixapupis.pdf
    • https://dixevivoruze.weebly.com/uploads/1/3/1/4/131437918/d09daf2.pdf
    • https://modatuna.weebly.com/uploads/1/3/7/5/137509789/9493670.pdf
    • https://gininigexaviw.weebly.com/uploads/1/3/5/3/135350692/873500f.pdf
    • https://gavaxavudo.weebly.com/uploads/1/3/4/5/134581950/30806d347f492.pdf
    • https://cdn-cms.f-static.net/uploads/4410201/normal_5fd1f002a4931.pdf
    • https://puzujesojanigo.weebly.com/uploads/1/3/4/5/134504435/ececfe41b3f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0f6f4884-d170-46d1-809e-f04cf7a329a9/ganpati_atharvashirsha_in_marathi_download.pdf
    • https://uploads.strikinglycdn.com/files/5f5ffe0d-cf56-40c4-b5eb-ec1ff6c9c99d/60748241185.pdf
    • https://uploads.strikinglycdn.com/files/f11bde95-c448-45d0-a014-ae57e1823f7a/93959123207.pdf
    • https://uploads.strikinglycdn.com/files/0077ab5e-07ea-4322-a66d-27ba5a6b1595/resumaxipirirubiruwopol.pdf
    • https://uploads.strikinglycdn.com/files/ce4a7f5e-f7d6-4eaa-8269-8f092496028d/70058337761.pdf
    • https://uploads.strikinglycdn.com/files/c412ba87-b753-48bb-ad8f-c05f0a7c3373/baldurs_gate_2_multiple_romance_mod.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcdd.bin
f94744560b7fdd4b0ec6e78e1069f02aafe3064fcaa0940cd17256d4bb9a09e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDD 5848 bytes
font_01_sfnt_off000110b1.bin
4a6a196ee708e73011275cbe0bc28cbf5f0a38a2e8981e89ecbddb8cb43e3266		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110B1 11132 bytes

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