Malicious PDF — malware analysis report

Static analysis result for SHA-256 367b64aa5343aaef…

MALICIOUS

PDF

69.0 KB Created: 2021-09-30 14:03:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 70dae3a939dbeff0b24e537712e1c280 SHA-1: 3603d78175695e09c199bede86572019e91e3d6d SHA-256: 367b64aa5343aaef2e8d1cccc26e8a6b09c6c4958cbf5ca7f9841df5d8ca518f
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. The 'PDF_IMAGE_LURE' heuristic indicates it's an image-only document designed to trick users into clicking an embedded link. While the document body is heavily obfuscated, the presence of numerous external URIs, many pointing to disposable domains, supports the phishing and link-farming nature of this document. No scripts were extracted, but the overall structure suggests it's part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 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 https://rijst.nu/userfiles/file/85997263478.pdf In PDF document text
    • http://drivingschool-brno.eu/files/75007525949.pdfIn PDF document text
    • https://garnizone.com/userfiles/file/pikikejegamo.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/jowusinitabilikosef.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/62805538956.pdfIn PDF document text
    • http://ativn.com/upload/file/67444430844.pdfIn PDF document text
    • http://erpos.sk/data/files/21048281815.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/74668674052.pdfIn PDF document text
    • http://bodybybodyology.com/ckfinder/userfiles/files/36454225741.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/6153620105.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/68724433978.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16130134ad8d2f---fixilenurove.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/4441e0027388aefa7017a5ef9be35d90/31534775074.pdfIn PDF document text
    • https://tutorbolivia.com/userfiles/file/39835324811.pdfIn PDF document text
    • https://jgranit.pl/userfiles/file/mikulemofoxowokuve.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/movasosepuxipenozibex.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/80256183003.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/vogixezuvazipanabisoj.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///91763025526.pdfIn PDF document text
    • http://quatangsongvan.com/hinhanh_fckeditor/file/84390245270.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/laxapowitiroselab.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/regedoxulotudutofevij.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/futudulaxezorowima.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=when+sending+cv+by+email+what+to+writePDF 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_off0000b0da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0DA 14216 bytes
SHA-256: d8a51fe468ce392be8220f7511de1eba71a7aeb82b58ef109aeb1aecf9e8f887
font_01_sfnt_off0000d3ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3ED 11216 bytes
SHA-256: e9ad9a720ecc7f46b281d6c47c592c0dc1cff6686fe3b4331565fa6601abc2e4
font_02_sfnt_off0000edde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1