Malicious PDF — malware analysis report

Static analysis result for SHA-256 01d78fd03f0aa4f8…

MALICIOUS

PDF

83.9 KB Created: 2021-03-24 10:33:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 8ef9d7b4e73605eff226d00ab4e3f9c4 SHA-1: d8463cdacaf89b6c0774f61e3b0e80f943b959eb SHA-256: 01d78fd03f0aa4f8f238f6a9247c2e7af43576f80d2bd7e18ccc7d1cffe0d60a
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/award?keyword=automatic+transmission+repair+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4412761/normal_5fe85894d2eb6.pdfIn PDF document text
    • https://lurotafimeka.weebly.com/uploads/1/3/0/7/130740015/b75c770.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425487/normal_60501e453ef59.pdfIn PDF document text
    • https://basopuseg.weebly.com/uploads/1/3/4/7/134703880/dafulufesupe.pdfIn PDF document text
    • https://ginadilu.weebly.com/uploads/1/3/4/7/134768391/8264424.pdfIn PDF document text
    • https://vusuvorolom.weebly.com/uploads/1/3/4/5/134501440/2053164.pdfIn PDF document text
    • https://xuzimelo.weebly.com/uploads/1/3/4/1/134132070/vejefujawetomid.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lepigofogirevog.epizy.com/tupunizunorow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e6775b6-35d8-4509-934a-3af1adf38b5a/6231082688.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eba6d248-b37a-4bae-afad-6e74dd2381b2/honeywell_econoswitch_rpls740b_programmable_switch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ca1bfc0-4a8b-4c49-a1e3-779050a899a2/what_is_lan_man_wan_with_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e274a840-99ad-4678-bea8-de124b730aa0/51839681989.pdfIn PDF document text
    • http://lokimutopilar.epizy.com/snaptube_app_apk_for_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce0655dc-bea4-463b-b44b-f89a381a57dc/siduxesexuluxeborikanapug.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_off00010c03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C03 5260 bytes
SHA-256: 9e28b041a0b3aca3583f82b1b55714aafceac1fe2d21427f93820d29953a45fe
font_01_sfnt_off00011dc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC8 10228 bytes
SHA-256: 38c311e764fc44776a49936112e8aac02471a0908d6e669fb91dca72a6047b63

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