Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0db56ff31a11e64…

MALICIOUS

PDF

84.8 KB Created: 2021-09-15 18:47:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e1e7493e41ad0a5b1e8a4d317ba9e729 SHA-1: e6d4e0aea372b9e59bc65d8e58af8546ea16fb83 SHA-256: f0db56ff31a11e64f465d3ff1a4aff26ca236d787a3f6436a83d4ed66c6262b7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which point to suspicious or unknown domains, suggesting a link farm or phishing attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document for containing many links on disposable hosting. While no scripts were directly extracted, the presence of external URIs and the ML classifier's high confidence score indicate malicious intent, likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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://kattliv.com/kattliv/admin/userfiles/file/82194304785.pdf In PDF document text
    • http://brianhaymore.com/images/e/file/12150330598.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/33644600271.pdfIn PDF document text
    • https://enerjimakine.com/tsrm1/img/userfiles/file/wobose.pdfIn PDF document text
    • http://alotercuman.com/ckfinder/userfiles/files/6757256645.pdfIn PDF document text
    • http://full814.com/upload/files/94118790927.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/14231656442.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/41318477506.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140aedaf3532---pogoserazisapewe.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/nuwosabafedirubafuga.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/32897698472.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210907220503.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/barebopifaraxizazaxawiwo.pdfIn PDF document text
    • http://squash-fitness.cz/userfiles/file/migusobi.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/14759515446.pdfIn PDF document text
    • http://carbonelite.ru/file/zogozezejisopiwubegi.pdfIn PDF document text
    • http://rtm-plus.ru/ckfinder/userfiles/files/86709887167.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/musaxovasoweridujorirat.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/91667100075.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/gedivotitibodowafunudazip.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/35024790447.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/zafeke.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/karubotixibe.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142016dd91b4---1218192827.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/bavigijab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=gta+5+in+android+phonePDF link annotation
    • 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_off0000e811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE811 17620 bytes
SHA-256: c89dff43de21472371a7d3c836bf04f9dc71ddfcef08ef1fc654933fac60d96b
font_01_sfnt_off00011635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11635 10448 bytes
SHA-256: e9e7bfb4a63dfb0f474f1a63d88c1ec38d1742c83328488b5f481d14c91716cf
font_02_sfnt_off00012de5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1