Malicious PDF — malware analysis report

Static analysis result for SHA-256 76afac922592ce29…

MALICIOUS

PDF

60.1 KB Created: 2020-11-10 07:32:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 31109a7c3abd546dad02b0a48b1b6a68 SHA-1: 11d1c3a3cdc1934af3883eaff81356c48b7a941f SHA-256: 76afac922592ce2989799b95f93104d2e2b9571d01130204ce66112d6f8fa55a
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many pointing to disposable hosting services, and one link to a known malicious redirector. The document body, though heavily obfuscated, contains text related to a 'solutions manual', suggesting a lure to trick users into clicking these links. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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 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.
  • 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://traffmen.ru/aws?keyword=klein+solutions+manual+3rd+edition In PDF document text
    • https://pewoxunoxosizix.weebly.com/uploads/1/3/4/3/134318290/7a081a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367273/normal_5fa2057e67b93.pdfIn PDF document text
    • https://xalipifizipig.weebly.com/uploads/1/3/1/3/131379045/dixonitagak.pdfIn PDF document text
    • https://wisizexabebaj.weebly.com/uploads/1/3/4/4/134461468/bf4f36.pdfIn PDF document text
    • https://jujizifij.weebly.com/uploads/1/3/4/3/134309807/rajopijigiduro-kilarujata.pdfIn PDF document text
    • https://xazojitov.weebly.com/uploads/1/3/1/4/131408465/3546336.pdfIn PDF document text
    • https://zekasujiminog.weebly.com/uploads/1/3/4/3/134366003/zinovenirusaz.pdfIn PDF document text
    • https://rabifupokuwu.weebly.com/uploads/1/3/1/1/131164250/663f7b7b1d3d.pdfIn PDF document text
    • https://julupovopanar.weebly.com/uploads/1/3/4/7/134732987/5eed35aa99a.pdfIn PDF document text
    • https://mimejimewib.weebly.com/uploads/1/3/4/6/134608848/535cf44d5fd.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/04f35aed-184e-4570-abff-241c5305506a/miradexukub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0967e5e4-4212-40d9-a188-7547009642ab/54363050888.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24abc7ee-98a2-4f8b-992d-513a56958a87/35097256910.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_off0000af9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF9F 5104 bytes
SHA-256: a0b473a177ce6d975e4021364ff150e677971ff0117427f82ed9b2d9690382ba
font_01_sfnt_off0000c0df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0DF 10208 bytes
SHA-256: baa20883ccbff84296abc165b6d765b945480d83a67ed4659f705411fc912659

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