Malicious PDF — malware analysis report

Static analysis result for SHA-256 20636c9ade672105…

MALICIOUS

PDF

70.0 KB Created: 2020-12-17 18:01:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 8bab140fabd1fef556c0cb9a77c8966f SHA-1: dce691961b82d97808b6b3b176b4f87470f4ae24 SHA-256: 20636c9ade6721051657d15dc2c29544c7232ae06696599a3cef83a8d3092eef
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://trafficel.ru/strik?utm_term=standard+cost+percentage+formula PDF link annotation
    • https://sidunaxegizu.weebly.com/uploads/1/3/0/7/130776644/paxemor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386094/normal_5f9adde4ee0ad.pdfIn PDF document text
    • https://batigagonu.weebly.com/uploads/1/3/4/7/134774980/4062718.pdfIn PDF document text
    • https://kuvegegujumil.weebly.com/uploads/1/3/4/3/134367432/zavugil_mopuduku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413563/normal_5fa5e34fd2470.pdfIn PDF document text
    • https://zevodajiwagadiz.weebly.com/uploads/1/3/4/3/134340874/nodesowumuwuxug-nanenuwogeg-mogozewemoka.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482418/normal_5fca0934f0e73.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426263/normal_5fad8a913d2c6.pdfIn PDF document text
    • https://mibebedobosuv.weebly.com/uploads/1/3/4/3/134322580/300bc84d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/315dfbbd-d3fd-49cd-bcdf-1a21acc90f09/40413344854.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83fa3bbd-499e-4898-a344-38781ec52c6e/blood_of_elves_english.pdfIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/bibliografia_apa_libro.pdfIn PDF document text
    • https://s3.amazonaws.com/jagux/pipeline_processing_in_computer_architecture_ppt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5eb65da-3c64-4cbb-9600-0068d0e106a5/kukoraziva.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_off0000d409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD409 5580 bytes
SHA-256: f50c2fb430b19833726a5e31ac85b8475ed77de5e012fd31cc5d7088181aefe2
font_01_sfnt_off0000e6f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F4 10740 bytes
SHA-256: 730d0f71541844a6065a343700736bc92272ca5e88ae3119a6eae4ccb3b30078

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