Malicious PDF — malware analysis report

Static analysis result for SHA-256 687422962bfb40d3…

MALICIOUS

PDF

89.0 KB Created: 2021-02-16 10:54:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 097de868299da9351f6d9e815c144fd5 SHA-1: a4259daaa7b2023814aadedc65930e1281d937ff SHA-256: 687422962bfb40d3df5bceed9aea7af709a580fc71d257e620430992e327c08f
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links pointing to known malicious redirector infrastructure, specifically identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The document body, though heavily obfuscated, suggests a lure related to troubleshooting a gas hot water heater, likely to entice users to click the malicious link. The presence of numerous links on disposable hosting further supports a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=how+to+troubleshoot+your+gas+hot+water+heater In PDF document text
    • https://static.s123-cdn-static.com/uploads/4421051/normal_5ff4d126200e1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463803/normal_5fe247e5eaabc.pdfIn PDF document text
    • http://drnextact.xyz/movistar_colombia_telefonosb3l8b.pdfIn PDF document text
    • http://laxana.ru/tegirezidotabomelomamoxozv9ogl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530429/normal_5fd0dd159b7db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479460/normal_5fdadaab99c2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445880/normal_6025b5f292a5f.pdfIn PDF document text
    • http://itasda.online/dixosovamazijizuvowlbz37.pdfIn PDF document text
    • https://xetuvamabur.weebly.com/uploads/1/3/1/4/131409037/22677248.pdfIn PDF document text
    • http://zatorigixoluji.iblogger.org/interview_questions_integrity_answers.pdfIn PDF document text
    • https://jixejuterekafiw.weebly.com/uploads/1/3/4/5/134508928/6799647.pdfIn PDF document text
    • https://vumerajijo.weebly.com/uploads/1/3/2/8/132815742/9967017.pdfIn PDF document text
    • https://disumudumoronu.weebly.com/uploads/1/3/1/4/131408153/d46e06890143.pdfIn PDF document text
    • https://favotofuti.weebly.com/uploads/1/3/1/8/131871633/e348a4e3.pdfIn PDF document text
    • http://trudogoliya.online/83786899248rjput.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bumezemenunaxiv.epizy.com/ansible_template_src_and_dest_are_required.pdfIn PDF document text
    • http://wevujonixusenex.rf.gd/36416736966.pdfIn PDF document text
    • http://fujeraxujixu.epizy.com/how_to_be_a_successful_leader.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_off00011f87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F87 5240 bytes
SHA-256: e747b80d3b9cb2704860c8f1c814229a57c01f3c2f3f1eb72febc5422d27f926
font_01_sfnt_off00013167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13167 10892 bytes
SHA-256: 31b034d6760bfafa7a8e28e4a188859d27da0dc7ac32604c2bcfea614c3c72db

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