Malicious PDF — malware analysis report

Static analysis result for SHA-256 2596ca009819d43c…

MALICIOUS

PDF

75.1 KB Created: 2021-09-16 23:47:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a82154b03010e463171948b6b6ed8324 SHA-1: 9c101adf990ba5142053ced5b7780b5c7afa20f3 SHA-256: 2596ca009819d43ce92733202b452d9a7da60aa3b4e4a140d05519771a053953
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable domains and exhibiting characteristics of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://smidgel.ru/uplcv?utm_term=uphill+rush+4+game PDF link annotation
    • http://tjtvina.com/Upload/files/lutuladazuxatorisudasux.pdfIn PDF document text
    • https://icbacademy.com/upload/files/22243249651.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/senafuluzotegubadopasajo.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/wovepibimexivevawivo.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/4450814668.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/vatup.pdfIn PDF document text
    • https://rotterdampools.com/contents/files/xasuviwulepirudozudife.pdfIn PDF document text
    • http://mopron.ru/upload/files/87082073924.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/97117651823.pdfIn PDF document text
    • https://fetogram.ir/images/upload/files/43265822502.pdfIn PDF document text
    • http://ipublicity.cz/data/file/99403152087.pdfIn PDF document text
    • https://topupdana.com/contents/files/noxagimozumapej.pdfIn PDF document text
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/gorulixizagar.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/5pu536akolc9nv131vju4n645a/79169212712.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/ruzobinomogifowuw.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/57593537590.pdfIn PDF document text
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/lolawowa.pdfIn PDF document text
    • http://chuanghuilaw.com/filespath/files/20210910001500.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/gizaluxa.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/64a392f270422e532e2f6692ad021313/mukigerebosobed.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/vunemodufogexajopenoge.pdfIn PDF document text
    • https://leganordavigliana.com/uploads/file/27743562159.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c09e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC09E 17832 bytes
SHA-256: 98689d86b1d071de0fea58b22a86204deaa51f3e736952f64ff67ab3d32b45ac
font_01_sfnt_off0000eef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF5 10560 bytes
SHA-256: 5a4d0d4bc7c774726fa65cbc419355151a5567a4bdc5eb16cddd0d7f85046899
font_02_sfnt_off0001070e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1