Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c79dc47d5f8abe7…

MALICIOUS

PDF

76.2 KB Created: 2021-05-22 23:46:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 7036891a9fe5e603da76840eef5ae04e SHA-1: 20999dbe4fa0f8fe9511bb93871d59feacea790e SHA-256: 8c79dc47d5f8abe75d2706da418ae39ff422cee36249cd495a760c3463874635
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting services, and uses a deceptive title ('Mercedes benz c230 radio wiring diagram') to attract clicks. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam campaigns. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious or spam-related websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://fokemale.ru/strik?utm_term=mercedes+benz+c230+radio+wiring+diagram PDF link annotation
    • https://tolajugim.weebly.com/uploads/1/3/4/6/134647220/supuvizuxejevogi.pdfIn PDF document text
    • https://dezilitew.weebly.com/uploads/1/3/4/7/134728488/pudazusegif.pdfIn PDF document text
    • https://leduxuma.weebly.com/uploads/1/3/2/8/132814900/6986629.pdfIn PDF document text
    • https://burakizu.weebly.com/uploads/1/3/1/0/131070688/207958.pdfIn PDF document text
    • https://sidomepavoresob.weebly.com/uploads/1/3/5/3/135322675/vixuk.pdfIn PDF document text
    • https://tibejupevuk.weebly.com/uploads/1/3/4/4/134470882/2575472.pdfIn PDF document text
    • https://zekasujiminog.weebly.com/uploads/1/3/4/3/134366003/70b61418346.pdfIn PDF document text
    • https://wajeditaveva.weebly.com/uploads/1/3/2/6/132696335/763554.pdfIn PDF document text
    • https://tixonanixob.weebly.com/uploads/1/3/4/8/134890866/selerukida-dodigebadajaxi-defesapet-vagediw.pdfIn PDF document text
    • https://vitasexabu.weebly.com/uploads/1/3/0/8/130813400/8486308.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/7478f512-73af-42a6-a563-6d55077fb43c/36248507541.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c678b09-80cc-4b6e-ac9d-5f56585714f2/miggs_in_silence_of_the_lambs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb95b61a-e787-4f53-a329-241df630a4c9/gopro_hero_3_plus_silver_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d629e8f-7e2a-43d0-a42f-f3aef9782e94/disetuwisuvazelakawewus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a20e999b-509a-4cad-bb0a-050a5f4ebf81/handwriting_practice_vimala_alphabet_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc164373-b1c5-48c2-94d2-afa40e9ccacb/tevelez.pdfIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/69528364632.pdfIn PDF document text
    • https://s3.amazonaws.com/lososimap/app_de_animeflv_para_android.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_off0000e8a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A2 5952 bytes
SHA-256: 82acc9a26325fb7ebd5e46c02abceb15d333072b2abd293afc3b4a8ac958b076
font_01_sfnt_off0000fcf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF0 11384 bytes
SHA-256: f60531e9e686b269eec15071f03172f3cbfcdcb65aea106f76698b7de68a41cb