Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc5dc5ffad5f9b10…

MALICIOUS

PDF

92.0 KB Created: 2021-02-25 01:43:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: d4c5a70a015167f18e253e579ac12608 SHA-1: f79d8511e0d219b1907aee8770a4d8d10ad656eb SHA-256: bc5dc5ffad5f9b10fd2d1b05c32bbbfb19d8ba1e8df9dbd64dde69a1e92bb783
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains or link farms, indicating a likely SEO spam or phishing campaign. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards a technique commonly used to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/strik?utm_term=remington+700+sps+tactical+223+barrel+twist PDF link annotation
    • https://cdn.sqhk.co/mogilirexexa/x5oJpgh/lusopemuz.pdfIn PDF document text
    • https://cdn.sqhk.co/wakewafo/PgdhbSG/petaxepokagadaforenojuwe.pdfIn PDF document text
    • https://cdn.sqhk.co/pepupiribojo/iehiVT9/82943506808.pdfIn PDF document text
    • https://zejafopo.weebly.com/uploads/1/3/4/5/134505046/rudekitidav.pdfIn PDF document text
    • https://cdn.sqhk.co/kerikone/EhghdMZ/wiwilemozowazerudi.pdfIn PDF document text
    • https://donelodef.weebly.com/uploads/1/3/5/4/135401433/65af7e5db8.pdfIn PDF document text
    • https://cdn.sqhk.co/soxuvezosapa/jediifp/8253949350.pdfIn PDF document text
    • https://bumewotosebixab.weebly.com/uploads/1/3/5/2/135298585/moxujo.pdfIn PDF document text
    • https://cdn.sqhk.co/nedivixozu/47gfK12/josafipizexuv.pdfIn PDF document text
    • https://cdn.sqhk.co/lexaxemiji/jjjjbgi/68866065268.pdfIn PDF document text
    • https://cdn.sqhk.co/famuxina/igegjha/mabubozibekurilimelekiz.pdfIn PDF document text
    • https://zovakilezogavi.weebly.com/uploads/1/3/1/1/131163957/dutigarib-babin-binulul.pdfIn PDF document text
    • https://devudupaf.weebly.com/uploads/1/3/4/8/134880603/13ac826f3.pdfIn PDF document text
    • https://kirugalepolofaw.weebly.com/uploads/1/3/4/3/134340862/9717936.pdfIn PDF document text
    • https://cdn.sqhk.co/lawipavoso/F9xiaHF/ps4_emulator_for_pc_download_no_survey.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wexuvuxidera.epizy.com/goalparia_bhawaiya_video_song.pdfIn PDF document text
    • http://vexelikepe.epizy.com/indefinite_pronoun_worksheet_answer_key.pdfIn PDF document text
    • http://mawarine.epizy.com/rozivemovuxezub.pdfIn PDF document text
    • http://wevikokuzufos.epizy.com/foregaxikewa.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_off0001283b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1283B 6012 bytes
SHA-256: e2569d46ab311234ad947c07f28282917be1b8eaba801e886a1aa99354257aca
font_01_sfnt_off00013cb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CB6 11100 bytes
SHA-256: e17914175ab750bd8ce0fc8589561ebf22fc1a557a72c97116aa15f893746ab3

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