Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc5cf80b9ee8ee37…

MALICIOUS

PDF

72.9 KB Created: 2021-09-18 07:30:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 007ae5ea4a7a6d8729070538d9932e70 SHA-1: f672b291df515fafe90bf1f99433ad396af11b41 SHA-256: dc5cf80b9ee8ee3712d8d10a21b376fbf73b1563b80ce72b1d4ad2a522cd23c9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. The presence of external URIs and the link farm structure strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://catamma.ru/uplcv?utm_term=hunter+assassin+apk+mod+download PDF link annotation
    • http://cauthangdep24h.com/upload/files/lawif.pdfIn PDF document text
    • http://directartdeal.com/uploaded_files/userfiles/files/nozefepulenapofiwirudibok.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/zojunigisatejewogibuf.pdfIn PDF document text
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/loxesimetudiwe.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/vejibarelivozugidatosovo.pdfIn PDF document text
    • http://sportingfoundation.com/uploads/file/66139186989.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613df7c94fa6f---48269981396.pdfIn PDF document text
    • http://szerecsen.hu/editor_up/59157328158.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/pirukonulowoxebi.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/dad2dcfa1b3bcfc7e7bc7f6ef88f6e61/fofenilopevokex.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/dulolefotepikevujupuvigoz.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/mumedirokaxeziwuw.pdfIn PDF document text
    • http://frickcontrols.com/uploads/files/mozuxumufabulegamejik.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/rorinejolavemode.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/60115586752.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/75235046781.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/87059736503.pdfIn PDF document text
    • http://apicn.net/upload/files/31501631566.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/kuboduwepetekako.pdfIn PDF document text
    • http://zbigniewrodak.pl/galeria/file/lixokeremejoxinizutogo.pdfIn PDF document text
    • https://huuphongplastic.vn/uploads/images/files/20816176793.pdfIn PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/sumanorujav.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/59527359092.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/38745695428.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/bolemulumazaritukabugo.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_off0000bc9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC9D 10824 bytes
SHA-256: 54a0f8667a9c4d871d25ffff42e36c14676f5fb049282c9435daee143e189cb0
font_01_sfnt_off0000d590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD590 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eda2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA2 16000 bytes
SHA-256: 99a1df1ae147bfbd5b1bac2ac2dae314445291882b86df62dda041ea8c4a75a2