Malicious PDF — malware analysis report

Static analysis result for SHA-256 c18d24a0b35fd304…

MALICIOUS

PDF

76.8 KB Created: 2021-05-02 05:15:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: e7ad1d6710504be5ad3acd760fc6627d SHA-1: 223aea6f1055c4314b22f7bf74b1d1a24a58c703 SHA-256: c18d24a0b35fd3045d4ae1c9a498c9c51b64cc1b0663de81b809d32c7c351407
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to external sites, many of which are hosted on disposable domains or link farms, suggesting a phishing or malware distribution campaign. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, but its primary function appears to be directing users to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://resalured.ru/strik?utm_term=what+is+a+depression+in+history PDF link annotation
    • https://zipelademijup.weebly.com/uploads/1/3/4/0/134017001/kupibubegepet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448724/normal_60148102491aa.pdfIn PDF document text
    • https://vumazara.weebly.com/uploads/1/3/0/7/130738753/wavaminadusigibopi.pdfIn PDF document text
    • http://chambreop.xyz/53818858712j2b1q.pdfIn PDF document text
    • http://relibafogat.sportsontheweb.net/wahl_hair_clippers_colour_pro_review.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387924/normal_60428ae3838a2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446502/normal_5fde459e29186.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446645/normal_60344e0038c34.pdfIn PDF document text
    • http://paxejunon.mygamesonline.org/angularjs_tutorial_with_examples_for_beginners.pdfIn PDF document text
    • https://vorujefam.weebly.com/uploads/1/3/4/3/134322124/vebemupibutigafogu.pdfIn PDF document text
    • http://santaparker.store/newokinuvimokijinumr3scp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f3b8d348-8566-49c9-a9f8-a2c3b9e1bc8e.filesusr.com/ugd/f1c748_0f5e5767590b420896585295a8b383cd.pdf?index=trueIn PDF document text
    • http://wuwedilejom.myartsonline.com/xukobepotuvazipa.pdfIn PDF document text
    • http://wejufutaz.onlinewebshop.net/transistor_biasing_and_stabilization.pdfIn PDF document text
    • https://20128683-61eb-4207-b985-d468b1a81fea.filesusr.com/ugd/0049ca_bacd62939dd040519141b9e3b7c4bcdc.pdf?index=trueIn PDF document text
    • http://mujebik.atwebpages.com/ceftriaxone_davis_plus.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_off0000efb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB2 5128 bytes
SHA-256: 63bff90350c0872f7e11b74d343eadabba2850dbb0ec5b75590faa7ac6eb7e3c
font_01_sfnt_off00010133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10133 10764 bytes
SHA-256: 0fb4e9558659d4881212afbf4b9a05f54ed76f09a9fb236c3e05666d69eb19c1

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