Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5fff92ff4352108…

MALICIOUS

PDF

68.7 KB Created: 2021-10-02 18:05:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7c5dcfcf5e160c8744a3cf287ccb2d72 SHA-1: 90853d516ab1b1f3e24df33c4a84a28c75b0aa01 SHA-256: c5fff92ff435210877c5ef8420b92131188a1b193a180846fc1590e67c8cf359
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF_IMAGE_LURE heuristic indicates this document is an image-based phishing lure, likely containing a hidden clickable link. The presence of numerous distinct hosts and URLs, many pointing to PDF files, suggests a link farm used to distribute malicious content. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://mottaing.eu/userfiles/files/31323982048.pdf In PDF document text
    • https://coebmsf.com/userfiles/file/ramozitutibukukovoxo.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/rorijerif.pdfIn PDF document text
    • http://mopron.ru/upload/files/zunozumipa.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/79192569366.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/lafotifom.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/59111224648.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/36133021214.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/2192769266.pdfIn PDF document text
    • https://phr4u.com/files/98011965159.pdfIn PDF document text
    • http://creativecoms.net/userfiles/file/26719333035.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/ca2b55921c40354d36ece9ebdfcb720a/31487469480.pdfIn PDF document text
    • https://ppkh.net/userfiles/file/devejuramiwudulezuf.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/gibememarenozijizufikemi.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/rofusez.pdfIn PDF document text
    • https://congnghieptauthuyvietnam.vn/upload/files/raxuwuravavosopitonok.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/vosujutudavufavomu.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/wesonoxofanijez.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/47714415628.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/folulale.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/4429070881.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=numerology+number+5+personalityPDF 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_off0000af95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7AC 11060 bytes
SHA-256: 99ca953a6867e6cbda210d4c79d36502c4faa9db2965ec615b61c412bd7fd2c1
font_02_sfnt_off0000e13d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13D 14372 bytes
SHA-256: 4705fcd31dffde31df9907228a19564a7cc2d7846dee560c02357203f992d625

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