Malicious PDF — malware analysis report

Static analysis result for SHA-256 3945b09cfb185625…

MALICIOUS

PDF

72.9 KB Created: 2021-10-06 20:53:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0801f412375fd80301d42b71d8bc7821 SHA-1: c69990d2fb261ced03fcecc49b72da6862da07c7 SHA-256: 3945b09cfb18562507f31f0f5fac30ef71fca19dec74ce423f2a5522ca504439
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm on disposable hosting, with numerous embedded URLs pointing to PDF files on distinct domains. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an intent to lure users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://sangiorgioautoservizi.com/userfiles/files/dirijobigimapafemalosura.pdf In PDF document text
    • https://vpmemorial.net/images/file/29538106805.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/70018689966.pdfIn PDF document text
    • http://suchanekstomatolog.pl/files/file/tirodikigitagulujuwanujom.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/26898572713.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/kofiziwepunubukopup.pdfIn PDF document text
    • http://instit.ac/ckfinder/userfiles/files/lotararunuv.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/6219573394.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/diwemefovodewemipuku.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/jirulojizufejopagew.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/58281902050.pdfIn PDF document text
    • http://harmonie-avion.fr/actualite/files/texibumuvewupajabevom.pdfIn PDF document text
    • http://www.itidharamshala.in/images/uploads/files/degajozivoxekixima.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/weragikilewotev.pdfIn PDF document text
    • http://abpjseah.news-read.com/upload/files/gikekoje.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/miwazazudadipuma.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/98270151508.pdfIn PDF document text
    • https://factorysales.com/userfiles/files/22369047081.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/pofaxuzakazarabad.pdfIn PDF document text
    • http://ih-consultant.com/ckfinder/userfiles/files/12310947905.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/tonisobexolat.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/gevaremoxap.pdfIn PDF document text
    • http://wamaeassociates.com/images/uploads/originals/file/gadesogizonelozokobeju.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/dolapesipededoziwuxafurit.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/52587280759.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=professional+disposables+incPDF 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_off0000ba86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA86 16692 bytes
SHA-256: a7b840441c5d4a8a4435852513b2ac9fb197fd0ec5dd96d7d9bbf397dd088e77
font_01_sfnt_off0000e566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE566 10656 bytes
SHA-256: ffc77e1caf77f8e349b3417c8a3019efbdbbe784a11f85d96b035fc5c00686e6
font_02_sfnt_off0000fda5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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