Malicious PDF — malware analysis report

Static analysis result for SHA-256 d808f12c16a9d2b5…

MALICIOUS

PDF

70.0 KB Created: 2021-10-03 22:50:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: afd708394eadf5abc409352e6f0beff5 SHA-1: f20e7d68200e4ff82330ff9ee51cdb94b908b51d SHA-256: d808f12c16a9d2b5a4b08f17a418a35b0a931d82e5c5024036e9c7fd14e6956c
146 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. The heuristic 'PDF_IMAGE_LURE' indicates it's an image-only document with a clickable action, typical for directing users to malicious sites. Multiple URLs were extracted, suggesting a link farm or redirection mechanism, though many are marked as unknown reputation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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 0 text block(s), carries a click-outward action, and is only 69 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://vanguardhungary.hu/userfiles/file/91616892131.pdf In PDF document text
    • http://studiodispirito.it/userfiles/file/77150640211.pdfIn PDF document text
    • http://siamintertrade.com/file_media/file_image/file/fanutuvogozoko.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/14534582788.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/sozevav.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/koxevotaz.pdfIn PDF document text
    • http://hulstcustoms.ru/uploads/files/tagoxivefekagoragibeme.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/24672925333.pdfIn PDF document text
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/2910462138.pdfIn PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210902111834.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/midepevig.pdfIn PDF document text
    • http://saveondealz.com/ckeditor/ckfinder/core/connector/php/uploads/files/85119589843.pdfIn PDF document text
    • https://soechi.net/userfiles/file/lefetobenoluxil.pdfIn PDF document text
    • http://esen.life/userfiles/file/jewarurutixejona.pdfIn PDF document text
    • http://songdolandmarkcity.com/userfiles/file/35358402007.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/difowevomekunevemox.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/2e83e79f95e8bc8538e6e09f6b7d4140/zepoxi.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614c39fd20897---rorukefodadidobipawom.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/69432674950.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/larixonemefizixukilu.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/dujaduk.pdfIn PDF document text
    • https://coffeetuanvang.com/Images_upload/files/gifoxuv.pdfIn PDF document text
    • https://asztromiskolc.hu/ckfinder/userfiles/files/vozukitita.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/simegufumisu.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/13881042144.pdfIn PDF document text
    • https://angkalaris.com/contents/files/xilukelozi.pdfIn PDF document text
    • https://aildf.in/userfiles/file/viruzudawududaw.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021090420074373499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=game+of+thrones+valar+morghulisPDF 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_off0000b663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB663 10868 bytes
SHA-256: ca65aa221efd59ea13ace8d8d378d2ebd66710faa86604cd7d2318afbaacf2c9
font_01_sfnt_off0000cf5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE771 13804 bytes
SHA-256: 8a1453d7754990ebae7bc0f33c3c4dcd95e500bcfed2b54917126fd8b006ded1