Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ad1d3f4e855f9d5…

MALICIOUS

PDF

87.5 KB Created: 2020-12-19 06:03:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 2b0f2b7b4b2c5fb01cc1a274a65254b0 SHA-1: b83829f714c7b8dd66cca96581e2df1735b4794d SHA-256: 5ad1d3f4e855f9d5eedc778f6d9c471d9a4cdd8394aba9985d299a705a5d4470
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafffi.ru/strik?utm_term=canon+imageclass+mf4890dw+service+manual PDF link annotation
    • https://vilewufatavak.weebly.com/uploads/1/3/4/5/134585542/wovari.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488332/normal_5fce39eb05e5e.pdfIn PDF document text
    • https://lipowuripipu.weebly.com/uploads/1/3/1/3/131378852/7137468.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413225/normal_5fd2ae12b8782.pdfIn PDF document text
    • https://juporolo.weebly.com/uploads/1/3/1/3/131380745/vabilodobafevavufit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368952/normal_5fa5d2c64bb8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388283/normal_5f90b4907ecc7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496577/normal_5fcb7c63d9a35.pdfIn PDF document text
    • https://jagusidenoz.weebly.com/uploads/1/3/4/9/134902343/4dd17e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387035/normal_5f99960846db6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479705/normal_5fbcf342c9295.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446497/normal_5fdc6c517164f.pdfIn PDF document text
    • https://vodoxakitukep.weebly.com/uploads/1/3/4/3/134335140/a1f8cdd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370278/normal_5fc8e84dd58e4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://static1.squarespace.com/static/5fc2e9962bbd74065813b99d/t/5fc473384e98326c02a039ce/1606710073999/belgarath_the_sorcerer_audiobook.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc12254405d5340f32af944/t/5fc4b0c59b1ed03538716efc/1606725834986/78814789615.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF93 5896 bytes
SHA-256: 9547023eaf9c9188e3118113694a7da352bece4be3c9108cd8f5268b6b9e7c19
font_01_sfnt_off0001139c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1139C 2048 bytes
SHA-256: f58dac70b5ce52bf81df34d1a822a0cb4f1e5c05be5d1d20ac4417136bd3fdfc
font_02_sfnt_off00011c79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C79 10516 bytes
SHA-256: fea7b2eba2ee83a7fdacaf513946fde12fe4a06b116c7e7e24d40a4e5e7260bf
font_03_sfnt_off00014051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14051 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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