Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef04b02ce38616af…

MALICIOUS

PDF

76.3 KB Created: 2021-04-07 14:13:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7c1876e60f963180a1b53ca5a0cb461e SHA-1: 671c18959fccf28a517ff68fbd34f4faf227047f SHA-256: ef04b02ce38616af2c2959a45ed6e3ac4e31fb82b8ce539c93642933bccd44c9
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links pointing to disposable hosting services, identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, with ClamAV specifically flagging it as a phishing trojan. The embedded URLs and the structure suggest a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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 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://dafemum.ru/123?utm_term=liberian+history+up+to+1847+pdf
    • https://tevadurut.weebly.com/uploads/1/3/2/6/132682826/sexuzinugodu.pdf
    • https://puxetesotomu.weebly.com/uploads/1/3/0/7/130739839/tavifewikanosaror.pdf
    • https://removevas.weebly.com/uploads/1/3/4/4/134443453/770cab6c.pdf
    • https://jezafemobad.weebly.com/uploads/1/3/1/3/131383748/5421809.pdf
    • http://gavojutopubiri.getenjoyment.net/accounting_fundamentals.pdf
    • https://pofisuxix.weebly.com/uploads/1/3/4/0/134016862/fa7dabe963b781.pdf
    • https://wiwetone.weebly.com/uploads/1/3/4/6/134660192/6278299.pdf
    • http://deladinabixek.sportsontheweb.net/the_book_of_life_2014_movie_storyline.pdf
    • https://fenikazegalo.weebly.com/uploads/1/3/1/3/131379965/252423.pdf
    • https://wadaxoleda.weebly.com/uploads/1/3/5/3/135311928/pobupezumon_bofopukixosov_wikanofonorilu_xegarut.pdf
    • https://fosuwelu.weebly.com/uploads/1/3/2/6/132695698/kiwepakesezajilotur.pdf
    • https://xexidizufom.weebly.com/uploads/1/3/4/5/134508107/tesemarikedup-jukusopuf-vitot.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nuxulikiwab/dekab.pdf
    • https://314a97e4-cc7b-499c-a999-42b15fb65c39.filesusr.com/ugd/fa4a73_955e4f97bd344ef29842ea1ae5723cce.pdf?index=true
    • https://d78d2789-9aef-4bfd-88be-9093bec910ef.filesusr.com/ugd/87a178_759f3cda066a492fb55b36ba69b476c5.pdf?index=true
    • https://s3.amazonaws.com/sepovutapakogaf/ribirejaxatolepakez.pdf
    • https://22fea36a-5e19-4af1-b4aa-fe6e1efe0ee9.filesusr.com/ugd/b5a188_78f4687d236c4bf98e76752ca8f7daa5.pdf?index=true
    • http://nufulavidibime.myartsonline.com/33853028607.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6dd.bin
0dde8c6476bc8f3e7e878f100306ed750e3823c9b2ae2bfe5a79c5483e0c264e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DD 5692 bytes
font_01_sfnt_off0000fa49.bin
1c9808b9af8783af2d925dfb66ac41674120102ca4d6cce7eb5e42f5b49d6236		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA49 11576 bytes

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