Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cbd6a115f3139ea…

MALICIOUS

PDF

78.5 KB Created: 2021-05-03 02:31:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 6c2f429e91d928ac1970226bb97f1558 SHA-1: 154f2ac65b242c8ee65d0d84c1f941ef69ac0a8d SHA-256: 1cbd6a115f3139ea8aab7618c9af8b5c044969248b6ed52ef7ae52ffa1de6a94
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent. The embedded URL 'https://vilenefex.ru/strik?utm_term=traductor+espa%25C3%25B1ol+ingles+con+audio' further supports the lure of a translator. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious activity.

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://vilenefex.ru/strik?utm_term=traductor+espa%25C3%25B1ol+ingles+con+audio PDF link annotation
    • http://stankovit.ru/inheritance_series_downloadoe39g.pdfIn PDF document text
    • https://zogazakuf.weebly.com/uploads/1/3/1/6/131636678/6bcbcc9ad.pdfIn PDF document text
    • https://cdn.sqhk.co/zuwiwejagub/je6Zif4/wurisirofakuwuxamesojomik.pdfIn PDF document text
    • https://cdn.sqhk.co/gigatakel/J5hbgfC/lusaxidixowiz.pdfIn PDF document text
    • http://ttop-shop.com/salupuomcjr.pdfIn PDF document text
    • https://cdn.sqhk.co/wugolekufo/Djgc6ii/8878410583.pdfIn PDF document text
    • http://pusewuvi.medianewsonline.com/58145100547.pdfIn PDF document text
    • https://cdn.sqhk.co/xokebuzizo/Xo4KVih/7298814162.pdfIn PDF document text
    • http://vvd.bar/11740767188xnvtc.pdfIn PDF document text
    • https://cdn.sqhk.co/benibavagoge/Ygfgh7d/35787982056.pdfIn PDF document text
    • https://roxilegetewus.weebly.com/uploads/1/3/4/7/134721251/kivonilu.pdfIn PDF document text
    • http://neliwiveles.22web.org/gaige_borderlands_2_guide.pdfIn PDF document text
    • https://joxetoxuluf.weebly.com/uploads/1/3/4/3/134391367/3968596.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://natetakadax.epizy.com/69794017578.pdfIn PDF document text
    • https://s3.amazonaws.com/wavunot/chill_out_trance_music_free.pdfIn PDF document text
    • http://lenuduxefo.epizy.com/pandoc_html_page_to.pdfIn PDF document text
    • https://s3.amazonaws.com/mojivikapeti/fesoluzedobedad.pdfIn PDF document text
    • http://sogirujik.rf.gd/bopesagigezukapomafi.pdfIn PDF document text
    • http://ziwivazud.onlinewebshop.net/6873540694.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_off0000e38f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38F 5400 bytes
SHA-256: 39a9cdead295562fa9b7261cb95e9dbf1eb83d1fad511f5a9c3b7ca0c1ef5ec0
font_01_sfnt_off0000f5b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B0 4468 bytes
SHA-256: 24b95b6e5484de098906be96cea2514eeaeed87d79c4a706556a7a2c2db3dbb2
font_02_sfnt_off000101a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A1 12548 bytes
SHA-256: 164eac669830c203140d8dc5170ab2493dee51dc5d9b8ef1ac4066e892f59584

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