Malicious PDF — malware analysis report

Static analysis result for SHA-256 a75bffd1091f3115…

MALICIOUS

PDF

81.8 KB Created: 2021-04-02 00:20:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c1df3771ce1091ab4cd8ac26138f87f1 SHA-1: 7fa72fc885f5310c15a72abe416fb2434099243c SHA-256: a75bffd1091f3115ffedb2a9ed9f654c8de05e4bd2832138d1c98c03d379fe48
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting services, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or SEO abuse. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content.

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://maypoin.ru/strik?utm_term=whitfield+pellet+stoves+parts PDF link annotation
    • https://cdn.sqhk.co/salasereki/ivVihBn/38157321636.pdfIn PDF document text
    • https://pilituxasi.weebly.com/uploads/1/3/4/6/134685590/kajediwawasowelevux.pdfIn PDF document text
    • https://bifixebuwo.weebly.com/uploads/1/3/0/7/130776276/zoxozof_relifemasukugom_kulukoge_furumujiku.pdfIn PDF document text
    • https://suxeredevi.weebly.com/uploads/1/3/4/0/134000194/luwapapevur.pdfIn PDF document text
    • https://ganegekisawaji.weebly.com/uploads/1/3/1/4/131406809/5811582.pdfIn PDF document text
    • http://soldatskaya6.ru/doxesovisosaticzqv.pdfIn PDF document text
    • http://avtovishki-msk.ru/ledupudikavakudadawotlnpr.pdfIn PDF document text
    • https://gunujudota.weebly.com/uploads/1/3/2/3/132303168/628335.pdfIn PDF document text
    • https://cdn.sqhk.co/daruluneti/dFa1ZHU/70186060842.pdfIn PDF document text
    • https://vunorizuwuxina.weebly.com/uploads/1/3/0/7/130774993/namoxazunemiki.pdfIn PDF document text
    • https://cdn.sqhk.co/mobirewin/d1hgfTm/sewoboxaxalezuvetot.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvebopeweb/jjhZAdz/oddbods_turbo_run_halloween_download.pdfIn PDF document text
    • http://reestr.site/10411612914j9vn1.pdfIn PDF document text
    • http://xsale.trade/sheikh_albani3fe5b.pdfIn PDF document text
    • https://didegesub.weebly.com/uploads/1/3/2/6/132681352/001eace94d7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a2ae8793-a99f-480d-a3bc-849ef63d34f7.filesusr.com/ugd/cc207a_e790ee97d0d94bbfa6c8f86e6111950e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f7ed6fe-4e5a-4f50-bef9-36053614c483/the_blind_assassin_review.pdfIn PDF document text
    • https://7aff118d-26f6-4d76-9bc9-1838009e7274.filesusr.com/ugd/f80014_480336a54d01413db6c1c62a12ac811e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6352cfc3-c070-435d-8682-7ff85f6dd68c/45263344594.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_off0001032b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032B 5200 bytes
SHA-256: 1183d10346fd41906da5f35197f00178e2e9551402a4998c291a6fdb15087f46
font_01_sfnt_off000114eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114EB 10992 bytes
SHA-256: 3d4f108e63d9b7880c6bd8c482c291f2448278dde16493d556b7bcdc8f16111a

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