Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ccd8187cf7b8beb…

MALICIOUS

PDF

71.5 KB Created: 2021-03-02 16:16:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 2692f21a6b8fdb7ac8de81eb21e47a7b SHA-1: 8c92cc3f0beef5cad270f15f4b00701678effd56 SHA-256: 1ccd8187cf7b8beb4a424445994c6c5a1f6e683369a1838c6182f5b0158c76a1
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, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used 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://dugedepap.ru/wb?keyword=plot%20mathematical%20graph PDF link annotation
    • https://gibexiwufanoti.weebly.com/uploads/1/3/6/0/136099712/9111821.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368741/normal_602e039e70b5a.pdfIn PDF document text
    • https://xatuguje.weebly.com/uploads/1/3/1/8/131856293/18e56d9054.pdfIn PDF document text
    • https://jonenatone.weebly.com/uploads/1/3/1/8/131872225/7848456.pdfIn PDF document text
    • http://bimupodum.iblogger.org/makuzaxuguwenudo.pdfIn PDF document text
    • https://popupobapovuzus.weebly.com/uploads/1/3/4/0/134012290/1b85fa61acf7eb2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494432/normal_60153867e7ae4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405195/normal_5fd798645f1c1.pdfIn PDF document text
    • https://bopamoverera.weebly.com/uploads/1/3/1/4/131408256/nixefixumorudal.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454971/normal_6004cfcba0417.pdfIn PDF document text
    • https://movefaka.weebly.com/uploads/1/3/5/3/135304133/3edddf562655356.pdfIn PDF document text
    • https://sezibuginodeso.weebly.com/uploads/1/3/4/4/134470526/b29cb76e723.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mewarur.rf.gd/coffey_anderson_better_today_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/zoxewudunigus/philippine_consulate_dubai_affidavit_of_support_form.pdfIn PDF document text
    • http://jetojepebonolo.epizy.com/google_sheets_script_onedit.pdfIn PDF document text
    • http://desovizipelo.onlinewebshop.net/9279053589.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_off0000dce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE9 5172 bytes
SHA-256: 51a5afa07efd79ec04b575f39989113d02796970aebe3198b2156ca123d935c1
font_01_sfnt_off0000ee54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE54 10328 bytes
SHA-256: efb1c5d435adc109d6a745e234b461d608590771c8c9d2dbfdc9b63a3bead6b8

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