Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec0a61ab21fa496f…

MALICIOUS

PDF

74.0 KB Created: 2020-11-13 12:49:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 0d68743c6b51eaa263495e804f957954 SHA-1: 97eae3191a79e5a4e585b0437df9074bb90efe0d SHA-256: ec0a61ab21fa496f741b9718b4edc038c99884a9398cc148ff6a7e54ea7cafac
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 0.9998

Heuristics 5

  • 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.
  • 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://trafftec.ru/strik?utm_term=the+misadventures+of+gwen PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413696/normal_5f9b6cd142d33.pdfIn PDF document text
    • https://razixolinatu.weebly.com/uploads/1/3/4/3/134384461/3791984.pdfIn PDF document text
    • https://dopikilazobowu.weebly.com/uploads/1/3/4/4/134488506/6922331.pdfIn PDF document text
    • https://lewuroluloxujul.weebly.com/uploads/1/3/4/6/134678017/3420229.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366027/normal_5fabdfa48cac2.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/a8007ded-ad50-4a25-8ba0-a19b5b9882f1/tozowonulipusaribakir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d53d2433-0fff-4893-a09e-88d3dfadf218/neopets_grumpy_old_king_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc32d5ab-e28a-4976-a449-2d259c9d3f9f/xulebozex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efcd9201-caf9-4c37-b3cd-e6201f8b3989/trait_factor_theory.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/128b561a-7a26-4652-bbee-4aa048059e9a/38051785988.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d27e954-2d02-4fba-afc4-cde4bbbc507a/xarusatetited.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ac8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC8B 17044 bytes
SHA-256: fc1210f2c2e482138451ae2e39a2c22806cab9a4077f2b597ec77796e2eda741
font_01_sfnt_off0000e2d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D2 5392 bytes
SHA-256: 511f2f5009b89700bdde30623cc36b9a936b04f864cbf117f8c19f86f9c1d42b
font_02_sfnt_off0000f50e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50E 10848 bytes
SHA-256: fa1fffbdb8f0a53840313c10979029c4b95d18a6e832f97e903bdf24dd80ff05

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