Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fbf44eeec84a8a7…

MALICIOUS

PDF

77.3 KB Created: 2021-05-29 11:26:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 9e40649b5e0d142e9e97ba054bef092e SHA-1: 582912108e31270087bd8c128d983193b69c2ae0 SHA-256: 6fbf44eeec84a8a7500f3e4f782f220a8425ac0d036d2fb65ffba78bf52ee28a
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/strik?utm_term=computercraft+monitor+api PDF link annotation
    • https://xezixopizanew.weebly.com/uploads/1/3/5/3/135314636/nuvowux.pdfIn PDF document text
    • https://libidipoxojab.weebly.com/uploads/1/3/5/9/135981854/8206688.pdfIn PDF document text
    • https://xadiditenir.weebly.com/uploads/1/3/4/7/134763486/45a1b09.pdfIn PDF document text
    • https://fogoranamixite.weebly.com/uploads/1/3/5/3/135390362/lijuluzojo_wexatupumar_webir_mosigu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366965/normal_60020b793a937.pdfIn PDF document text
    • https://rijokurep.weebly.com/uploads/1/3/4/3/134377239/5969084.pdfIn PDF document text
    • https://tusagenitig.weebly.com/uploads/1/3/1/4/131452801/442360d6ce39ee8.pdfIn PDF document text
    • https://teduruperalugo.weebly.com/uploads/1/3/4/3/134320262/limabotajexuwipam.pdfIn PDF document text
    • https://vuvowopivuvi.weebly.com/uploads/1/3/1/4/131410126/df972de9ee150c6.pdfIn PDF document text
    • https://lakukuvirukum.weebly.com/uploads/1/3/0/8/130874631/03c1f2871b85fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423431/normal_60222b742d938.pdfIn PDF document text
    • https://komakuzafoge.weebly.com/uploads/1/3/4/5/134576335/tidopowanubewo.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/026dc976-b6b4-4923-85cd-9133dd24161f/fedagivutor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbcd2a58-114d-471d-bdbd-0ba3576d4370/square_d_9013fsg2j21.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cea78ee3-bc1f-481f-a1d9-19fd03b4f8eb/50260241621.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a13f8b5-3d57-4218-bfe7-346afbe997fa/why_isnt_my_microwave_heating_up.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcbd42ff-2099-4f5d-bfe9-3cd0d9332a62/4082925293.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4ff323f-ab1a-4b53-a7a1-97c3545c31fc/mozitexigatetaxarebudi.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_off0000f46b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46B 4856 bytes
SHA-256: a8baa97c414621cf1d4174894d4f3a8e4b6e3c3caa1e2ca6b87cc4d34f9c0052
font_01_sfnt_off000104d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D8 10352 bytes
SHA-256: 20ae2bdb49540e92415fde390fd315e5b57b5527839ca19670cdca7c8fc69cc1

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