Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f462bb1167c2458…

MALICIOUS

PDF

72.2 KB Created: 2020-12-27 06:09:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: f322ffaae247c016bd99bf3ccd54dd8e SHA-1: 97212eb5b35081fb805f0544f852df0d1633ee31 SHA-256: 2f462bb1167c24586be25f3363884d57bc5a3dc05990ab8860ed3db50f2fcbf0
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous external URLs, with one prominent URL being `https://traffine.ru/strik?utm_term=blackboard+magic+slate+for+pc`. The document body is heavily obfuscated and unreadable, suggesting it's not intended for user interaction but rather to host links. The presence of multiple external links, some on disposable hosting, points towards an attempt to redirect users to malicious sites.

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://traffine.ru/strik?utm_term=blackboard+magic+slate+for+pc PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367275/normal_5fb4bb8815efe.pdfIn PDF document text
    • https://cdn.sqhk.co/jevipugirofi/ijUygc8/bawomaxuvigepoj.pdfIn PDF document text
    • https://dopozigixojak.weebly.com/uploads/1/3/4/5/134509916/dogebovapekur-zulodogamorola-fizoledi-vopurexopej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503787/normal_5fb025d1a2a31.pdfIn PDF document text
    • https://wifevotus.weebly.com/uploads/1/3/4/8/134897576/63cb89b361.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463532/normal_5fd12a5516b65.pdfIn PDF document text
    • https://cdn.sqhk.co/vakanaju/jtheeig/angie_s_list_property_management.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380695/normal_5f8b97525c9e4.pdfIn PDF document text
    • https://dezijetide.weebly.com/uploads/1/3/4/8/134864221/werutatiweroza.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500679/normal_5fc888a6502fd.pdfIn PDF document text
    • https://sibikobibe.weebly.com/uploads/1/3/4/0/134040949/sijop_sodoresapi_linibefijujob.pdfIn PDF document text
    • https://tenabawik.weebly.com/uploads/1/3/2/7/132710661/sezuv_sekobigifilamik_suzib.pdfIn PDF document text
    • https://cdn.sqhk.co/masamiwe/diahdia/repeniwos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484115/normal_5fb3a42345088.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/c8561c82-a3f0-4a72-92fa-4bad31218c3f/tonenum.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_off0000dc1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1A 5728 bytes
SHA-256: fd3c7e4db168392d0f2cfc9e348c68ab2c2f6a30f99047d112a57fbf8e75868c
font_01_sfnt_off0000ef83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF83 10752 bytes
SHA-256: f6367f715f26dbde9687fa16f76419128965e292b45d6cde7c0afb5dbf0cc749

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