Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac602acb46512333…

MALICIOUS

PDF

71.2 KB Created: 2021-09-16 04:37:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1c49421e7e252cb4114e169c08afce9c SHA-1: 1e0675442a89575ce5240bb9dd121b59766e0b63 SHA-256: ac602acb4651233324fdb2320e588f1baabfce26bc85d37b44c9a127d585e041
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of external URIs and the overall structure indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://infrive.ru/uplcv?utm_term=pdf+converter+pc+software+free+download PDF link annotation
    • http://wimborst-ceramics.nl/public/view/upload/fckeditor_images/file/30471833421.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/88930434456.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/68996850826.pdfIn PDF document text
    • http://yarpb.ru/pic/userfile/64723549569.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/72115546340.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/11340651233.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/73366272862.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/lotapewupe.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/fipazewo.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/70804342659.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/fb74fa16f0240cd6a0331afd5a526961/xegupudixa.pdfIn PDF document text
    • https://eguiders.com/uploads/vopokovavunasakilinomebu.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/miwevilidipikakobax.pdfIn PDF document text
    • http://dientrotiendathc.com/media/ftp/file/9985969403.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/nofexiwunumog.pdfIn PDF document text
    • http://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/73693706412.pdfIn PDF document text
    • http://mtkshop.com/images/uploads/file/wiputagazi.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/fumaduvorozozetelimelel.pdfIn PDF document text
    • http://umbabox.com/userfiles/file/wasakaku.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/vixibodulide.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/33482333805.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-11/20210911095708414120.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/a6ec4d214df810de7b6803bc92f1d9a4/49616754233.pdfIn PDF document text
    • https://deltaguvenlik.net/userfiles/file/puzilagadukok.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_off0000b4fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4FC 10672 bytes
SHA-256: 2c39118976fd05a1095c68e257ea297aa7cf3024fe640283a6f3f78bf0f071ae
font_01_sfnt_off0000cdb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e5c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C5 16052 bytes
SHA-256: 8fa86a668f98b7f2a84d5cd1c8b0d8b9bcaa739d59a8c83cc60866218721daf9

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