Malicious PDF — malware analysis report

Static analysis result for SHA-256 f482b0813bb5f870…

MALICIOUS

PDF

79.9 KB Created: 2021-05-13 15:43:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c2c40da380b70e0366dab892697f2f62 SHA-1: ccea99e264dddcb9389f52fc3e5f33ed16541b3c SHA-256: f482b0813bb5f870307a5c6501f4b8adf7e20c58b30d45d772e566a798ef106c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://golowaki.ru/strik?utm_term=west+bend+bread+maker+instruction+manual PDF link annotation
    • https://zugixipenelir.weebly.com/uploads/1/3/4/5/134591811/joguje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482847/normal_6021807c2f265.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412158/normal_6006657821ac5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393189/normal_602632ef2156f.pdfIn PDF document text
    • https://cdn.sqhk.co/goronikel/VR7Uthb/81600049825.pdfIn PDF document text
    • https://cdn.sqhk.co/gukokefa/ribNmjc/build_tiny_homes_ontario.pdfIn PDF document text
    • https://cdn.sqhk.co/vavetiset/Q2njahN/ballarat_tv_guide_monday.pdfIn PDF document text
    • http://mukinumatonewo.getenjoyment.net/50965318663.pdfIn PDF document text
    • https://zipinokigemido.weebly.com/uploads/1/3/4/8/134890871/koxuzi-danopadomumet-lolivitaru.pdfIn PDF document text
    • https://luzepomi.weebly.com/uploads/1/3/1/8/131856518/lawafejo_saviwevegeriv_gatibuzemadako_relusa.pdfIn PDF document text
    • https://satalediveli.weebly.com/uploads/1/3/4/0/134018026/0e0b0fc415dbaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374968/normal_602c8a340dc69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383792/normal_606a966828f72.pdfIn PDF document text
    • https://fotaluxig.weebly.com/uploads/1/3/5/9/135973299/5940392.pdfIn PDF document text
    • https://falopizesolirod.weebly.com/uploads/1/3/1/3/131379111/zadizijokug.pdfIn PDF document text
    • https://panulozeti.weebly.com/uploads/1/3/5/3/135351273/gixotejivojuz.pdfIn PDF document text
    • https://cdn.sqhk.co/guvelebul/gjgjggN/34111729264.pdfIn PDF document text
    • https://kefuluseze.weebly.com/uploads/1/3/1/3/131398598/3e65221e17a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392667/normal_603b40e473895.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nixomirorubu.myartsonline.com/taparubilirufar.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_off0000f92e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92E 5300 bytes
SHA-256: ab14fd3a2c73c4fd89f1646294a8f968ed8686d5f18d602019313806005b11a5
font_01_sfnt_off00010b2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2D 11404 bytes
SHA-256: 7b3227ac1e458ed3791b8ec02624e461c81acfbb1c1e4bc1fce1a6ce0ca69e74

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