Malicious PDF — malware analysis report

Static analysis result for SHA-256 26b23a35f6578098…

MALICIOUS

PDF

72.0 KB Created: 2021-06-09 12:00:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: cf9c111879cf14d1b42ac06175491820 SHA-1: 7a74f33562fe7f7a97b1ea091f88a9bfeb8464bd SHA-256: 26b23a35f65780988612cd7901a910d547aafdad0d52c20d9c463c876b40227f
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous external URIs and is identified as a link farm, likely intended to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing and potentially trojan delivery. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit user interaction for malicious purposes, likely involving the embedded URLs.

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://archism.ru/pbw?utm_term=annabelle+movie+in+tamil+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4455381/normal_5fe7d377281bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393763/normal_603b6e6723a68.pdfIn PDF document text
    • https://lumamiwaba.weebly.com/uploads/1/3/4/7/134735329/fea9e53612.pdfIn PDF document text
    • https://bizekexejanagiv.weebly.com/uploads/1/3/4/5/134593847/zelidav-xurufife-maborif-reraledevisop.pdfIn PDF document text
    • https://jofufibiwew.weebly.com/uploads/1/3/5/3/135347649/00cb840.pdfIn PDF document text
    • https://birinubawode.weebly.com/uploads/1/3/6/0/136026057/bijorupefeteliz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414847/normal_606e28963a68a.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4411937/normal_60b1ce5f44fd9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488807/normal_6016109ad05c6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fuvotobike.pbworks.com/f/what_is_the_message_of_pygmalion.pdfIn PDF document text
    • http://fajopab.pbworks.com/f/software_testing_interview_questions_and_answers_download.pdfIn PDF document text
    • http://zanonot.pbworks.com/f/nisegilapepuze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f021ff1f-86fc-459e-8b75-adfa4a3af526/how_to_replace_a_pegasus_shower_cartridge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a44a9220-941a-4bed-89f0-46d008d1dc96/ligezukulamumo.pdfIn PDF document text
    • http://numefen.pbworks.com/w/file/fetch/144779718/revue_technique_citroen_c3.pdfIn PDF document text
    • http://sipibujewadu.pbworks.com/w/file/fetch/144517977/livro_louise_hay_grtis.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_off0000dde5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE5 4976 bytes
SHA-256: 22bc97877fa727c5ba2cbc928113166f5e62bd0d3c0da0d8339a17432f5fd625
font_01_sfnt_off0000eed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED2 10556 bytes
SHA-256: b9bd423146df06e42e0171f4bfc75ca212d162c17dd5505dc9ac7f3bb084cc58

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