Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f8804a488f3c680…

MALICIOUS

PDF

73.3 KB Created: 2021-09-25 10:05:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c599b1ac30e2db92ec8469bf270e4959 SHA-1: d9b250d0eed10f53701b96721d576901610b0ba6 SHA-256: 7f8804a488f3c680a9d68a1f22bf4e8123606a79f1559221b466e5b6c4287d97
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, with a heuristic identifying it as a link farm on disposable hosting. ClamAV and an ML classifier flagged the PDF as malicious, specifically as a phishing trojan. While no scripts were extracted, the structure and URL distribution suggest an attempt to lure users to potentially malicious sites, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://ketex.com/trcgp/ckfinder/userfiles/files/tatowegotibut.pdf In PDF document text
    • https://musikkursus.dk/userfiles/file/38633657263.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/nuvasowuwumobisad.pdfIn PDF document text
    • http://bresky.cz/res/file/49774522643.pdfIn PDF document text
    • http://paglialonga.it/userfiles/files/voduveruromagavarofexalo.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/63058537526.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134387934968---kexubena.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/xefosilozag.pdfIn PDF document text
    • http://zgic.ru/!upload/files/97189695429.pdfIn PDF document text
    • https://sambelteri.com/contents/files/tovemoninotu.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/posuva.pdfIn PDF document text
    • http://innersolutions-uk.com/file/95054251067.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/92621389728.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/pefiwin.pdfIn PDF document text
    • https://www.nissan-utilitaires-melun.fr/ckfinder/userfiles/files/nunimarikimogiluvire.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/zitafebisep.pdfIn PDF document text
    • https://ever-progress.com/upload/files/83440750752.pdfIn PDF document text
    • https://gppacdatabase.net/userfiles/file/gadokodiwomafora.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/652127107.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/rofetokitijobogise.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/dotumibidulemegodevi.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/bikitebiriwedeli.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/9289774850.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=marvin+sapp+praise+him+in+advance+lyricsPDF 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_off0000b9b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9B9 10732 bytes
SHA-256: 2943664f78c974e42d83df95e05bad967369c729541450f7c92e46e0022fd967
font_01_sfnt_off0000d228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD228 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3A 17464 bytes
SHA-256: 1a5836fca4507597747a2111e58e32425e6924f2189a12200a3767dcc598ac59

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