Malicious PDF — malware analysis report

Static analysis result for SHA-256 632a0176206af103…

MALICIOUS

PDF

75.3 KB Created: 2021-09-30 15:51:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9f1d5809bfda42d9f3b5cb7d53922a89 SHA-1: b820ceeb3b384f9a6f69368d0c4d89e96b896143 SHA-256: 632a0176206af103a90da013e169827587b0cc1d3492f0e38ab96a818d1aedaf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. The PDF contains a large number of embedded URLs pointing to various domains, many of which appear to be link farms or disposable hosting, suggesting a phishing or malware distribution campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a deliberate attempt to create a link farm for SEO manipulation or to host malicious content.

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://pistant.ru/uplcv?utm_term=bewafa+shayari+image PDF link annotation
    • https://petrovsky14.ru/docs/files/xanem.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/98072203715.pdfIn PDF document text
    • https://limadelimon.com/images/file/32675706128.pdfIn PDF document text
    • https://emenu.hu/editor_up/78462505722.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1615298404d112---vagup.pdfIn PDF document text
    • http://thomas-zigon.de/images/file/tetiwini.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/19309962126.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/1447711906.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/51179578503.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/gevelas.pdfIn PDF document text
    • https://otterdisplay.com/userfiles/file/nabokozigen.pdfIn PDF document text
    • https://marwaservicecenter.com/nbloom/fckuploads/file/powetakoti.pdfIn PDF document text
    • http://synhbio.com/upload/files/58274533211.pdfIn PDF document text
    • https://themalc.org/files/file/bevunuxikazubipemobedo.pdfIn PDF document text
    • https://nbretail.com.vn/ckfinder/userfiles/files/fobaroluzojatipibevomus.pdfIn PDF document text
    • http://gibkrakow.pl/uploads/files/vedagupatafuxeti.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/somutuli.pdfIn PDF document text
    • http://bodemveenweiden.nl/bodem-veenweiden-img/navoxikujesokexaseguzupe.pdfIn PDF document text
    • http://educaholistica.com/resources/img/imagesck/files/56967785224.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/pemuzomumavew.pdfIn PDF document text
    • https://eurotig.ro/file/76002359317.pdfIn PDF document text
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/jefem.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_off0000bac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAC7 20492 bytes
SHA-256: 6a31d85c5999416f79b748d5e0dfa218acff53a634c227d39b2d6250d8052ebf
font_01_sfnt_off0000efdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDD 10548 bytes
SHA-256: fe811b1815b88d5fb231f2f9a1d59e02c0b9799c8ce4786f03d2a4455f4e5fd6
font_02_sfnt_off000107fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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