Malicious PDF — malware analysis report

Static analysis result for SHA-256 009821ca50f26146…

MALICIOUS

PDF

65.6 KB Created: 2020-11-22 00:04:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 88b318ad1566e68ddb013dec7956a180 SHA-1: 286dc1d17a0358736a45c8bb2aa7fe022b31e793 SHA-256: 009821ca50f261467b62e24f729fa815828534b2cb445c359b3bc78d6bc096c5
186 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 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://trafftec.ru/aws?utm_term=free++adalah+aku+cakra+khan PDF link annotation
    • https://danawejenig.weebly.com/uploads/1/3/4/4/134499985/9123247.pdfIn PDF document text
    • https://pigogokeda.weebly.com/uploads/1/3/1/8/131857695/mamip.pdfIn PDF document text
    • https://bixizevabusiku.weebly.com/uploads/1/3/4/4/134403351/4044932.pdfIn PDF document text
    • https://zapineri.weebly.com/uploads/1/3/4/7/134707132/3510818.pdfIn PDF document text
    • https://zororoxuz.weebly.com/uploads/1/3/4/3/134309160/wirejuwewurewi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402533/normal_5f914903e512d.pdfIn PDF document text
    • https://naziwimirup.weebly.com/uploads/1/3/4/3/134371197/8eb82308fb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vuzufexarevima/sister_callista_roy_theory.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfb7a290-ac64-46c6-89ed-b551f840d3b4/felebipew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/956b6696-ec56-4e7d-99bd-8fd7ef66717b/41653929489.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50c1f361-a638-4bf5-961b-bf6f8cba3546/composite_piecewise_functions.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_off0000c4b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4B9 4868 bytes
SHA-256: e9cbdf92963755cfffa00e2aab9ffa2f0b615f1f8dc9064c32e9c7adea19c7e1
font_01_sfnt_off0000d53a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD53A 10724 bytes
SHA-256: ab3e154d487bd255ce3230b49b7a7da5249a6a2dbca47aefece5232506592a77

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