Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f4fcda3710e261c…

MALICIOUS

PDF

75.5 KB Created: 2021-09-18 23:56:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c232067626a9bbc93b3c0193692dac13 SHA-1: 2de8fb25b91c1743600a919e85a09247d5c96897 SHA-256: 0f4fcda3710e261c2fb577163026147e60e292a7bad4aa736842e8795fc455f9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable domains or link farms, indicating a likely attempt to redirect users to malicious sites. The file's structure and numerous external links suggest it is designed to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://huntic.ru/uplcv?utm_term=ebm+pyramid+of+evidence PDF link annotation
    • http://vamaconsulting.sk/userfiles/file/11917759411.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/pufufamupusogow.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-9-11/20210911043834957886.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/zabojarurebereletil.pdfIn PDF document text
    • https://gosselindesign.com/images/from_fckeditor/fichiers/59307302856.pdfIn PDF document text
    • http://phanmemerp.vn/attachment/files/54624735090.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/puxataruwalonin.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16134cb1e07a1f---46792642114.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/liwadozuxetavepepiweku.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/67983800772.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/dojezew.pdfIn PDF document text
    • http://stmarysharipad.com/userfiles/file/tujuvewid.pdfIn PDF document text
    • https://geniodelweb.com/file/popoloronolufebetowok.pdfIn PDF document text
    • http://intersonik.eu/upload/files/tokawol.pdfIn PDF document text
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/kekeb.pdfIn PDF document text
    • http://autosvilar.com/uploads/ckfinder/files/69981933606.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/narigikasejetodavodamimu.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/lasixogozowurifub.pdfIn PDF document text
    • https://ibericadearmerias.com/file/lepasibesevus.pdfIn PDF document text
    • http://khmim.com/ckfinder/userfiles/files/72928607103.pdfIn PDF document text
    • https://mkontakt.pl/dat/file/weguvakijemege.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50970384549.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_off0000c567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC567 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7E 10772 bytes
SHA-256: df3ad5c607c79023cb51f9b8180a8f143fe34e0b07987f3d8afa8457c12fda2b
font_02_sfnt_off0000f5fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FD 16716 bytes
SHA-256: 070e039f7c8f48b0a5ccc23a53082cf67c1fe599cc68b7beffcad3d0a9aae285

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