Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fddb96f5eea3372…

MALICIOUS

PDF

81.5 KB Created: 2021-09-17 23:02:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 0c49ef9fd123670cdf4291769d161a73 SHA-1: 798ae43998d8ab9e60bae873fb434d11947131a6 SHA-256: 6fddb96f5eea3372c69a5687528c1025b0f20ab83ddb8b02bcbc0a50a690c01f
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://mawaevents.com/uploads/file/sugidafuwemuzepup.pdf In PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/g9032il3e4avlpmdv6okg5hm6f/jadezejunesotulopupev.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/vamenodajalizinejikuza.pdfIn PDF document text
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/vifojab.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/dibejazakorile.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/6715627769.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/luvuta.pdfIn PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/11434202603.pdfIn PDF document text
    • http://www.offshoreyachts.net/web_upload/editor/files/xulukazewoti.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/31662966052.pdfIn PDF document text
    • https://medbillings.us/lightspeedweb1/file/86328962704.pdfIn PDF document text
    • http://tercovci.cz/files/file/99786006844.pdfIn PDF document text
    • http://pincodehub.in/userfiles/file/16628905769.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/xokotiwepipapurifo.pdfIn PDF document text
    • http://www.huescalamagiaenfotos.com/userfiles/files/73806663703.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/99497668627.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/xutulosozokugudum.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136900f9fc03---67678624360.pdfIn PDF document text
    • http://factorycontrolprojects.com/userfiles/file/dedafelavubafejoxaso.pdfIn PDF document text
    • https://ganport.pl/userfiles/file/93364777965.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/jolonaligipasemawose.pdfIn PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/wapilevumelopison.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/webewudi.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/pemim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+dm+on+instagram+androidPDF 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_off0000dc6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6C 10492 bytes
SHA-256: 8c4c41daeba89734f997e7000db8207aaab4f0225db43754aedb3fb1fabb5194
font_01_sfnt_off0000f403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF403 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C15 17296 bytes
SHA-256: 4816f1496bf333cecb7990386e3f61f25f8e6dd905cdd4b19a0dbb8c30ffa1e0