Malicious PDF — malware analysis report

Static analysis result for SHA-256 f760056b82dda0a9…

MALICIOUS

PDF

78.2 KB Created: 2021-06-08 02:32:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 96cedee576dc81611e959405a4f5086a SHA-1: 00272f9fd2ea1b00007ac98ee71f3931a475d344 SHA-256: f760056b82dda0a916cd28406e3280e2ba225a5fe2e2cb4230a621733160e7d5
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, many hosted on disposable domains, indicating a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/123?utm_term=testing+water+for+coliform+bacteria
    • https://pukejuzim.weebly.com/uploads/1/3/4/4/134457080/ebd67e.pdf
    • https://pudexaxetodeli.weebly.com/uploads/1/3/2/6/132683251/napinik-dimodenigeg-wuroxo-luxuguku.pdf
    • https://tosofovopige.weebly.com/uploads/1/3/3/9/133998067/rataza.pdf
    • https://wixolovab.weebly.com/uploads/1/3/0/7/130776385/fetarulizig-zojugove-miwiwetivumi-duridonolefoso.pdf
    • https://xikematevi.weebly.com/uploads/1/3/4/3/134392378/ff0931.pdf
    • https://paratokoke.weebly.com/uploads/1/3/0/7/130739311/gakudu_gobowajuviwa.pdf
    • https://vogexuweju.weebly.com/uploads/1/3/0/9/130969932/c0bcae6e99b2ae.pdf
    • https://sipusojatavajuw.weebly.com/uploads/1/3/4/6/134606658/6327045.pdf
    • https://vebipebetas.weebly.com/uploads/1/3/4/0/134012388/3952194.pdf
    • https://static.s123-cdn-static.com/uploads/4391620/normal_6005769c6f091.pdf
    • https://gemaxudemaxepeb.weebly.com/uploads/1/3/1/0/131070646/bezurid.pdf
    • https://majijajivetik.weebly.com/uploads/1/3/4/2/134265766/8d57bdd89c0.pdf
    • https://static.s123-cdn-static.com/uploads/4366008/normal_5fc7249202f1d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8b33cf7e-435f-4174-a682-89c7007df166/kamutafurixuvowasepis.pdf
    • http://fipivuzigoge.pbworks.com/f/5_snf_ingilizce_retmen_klavuz_kitab_indir_indir.pdf
    • https://uploads.strikinglycdn.com/files/3c8234ae-ae16-49ef-ba8b-fcbad33a3b31/how_to_graph_fx2.pdf
    • https://uploads.strikinglycdn.com/files/cc33ca16-175a-4e23-97f2-109a3431c86a/joneriravekijunixuzefas.pdf
    • http://ruwomodanom.pbworks.com/f/botokalokodozerefelaze.pdf
    • http://vibasuvezuz.pbworks.com/f/trane_heat_pump_owners_manual.pdf
    • http://veniwusuj.pbworks.com/w/file/fetch/144501717/naruto_vs_bleach_who_wins.pdf
    • http://rubepikonot.pbworks.com/w/file/fetch/144823356/74831831625.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_off0000f39a.bin
8de512c0a5bb328d8f174e6f704f76c60568c825c41141c268da7b2a0acc9bcd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF39A 5384 bytes
font_01_sfnt_off000105eb.bin
5b92128ebab718873a3ab23ce0cdf61e3222469d8a7254607cae061a51ff5d25		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105EB 11304 bytes

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