Malicious PDF — malware analysis report

Static analysis result for SHA-256 73c03a9732371ef8…

MALICIOUS

PDF

92.4 KB Created: 2021-09-14 11:18:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8b079e914554b29aa233b20eb35977b6 SHA-1: 883d85108fc2d304ab0ef8ae7895b74a8aed55e6 SHA-256: 73c03a9732371ef812bc0bc4a3e1e6ba69f3e87b5aac1cc4ecb3bff34be8d28b
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a specific ML classifier for malicious PDFs and ClamAV detection as a phishing trojan. The file contains numerous embedded URLs, many pointing to disposable domains, and is identified as a link farm. While no scripts were explicitly extracted, the nature of the PDF and its embedded links suggests an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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 http://luckdidea.com/ckfinder/images_store/files/retedefi.pdf In PDF document text
    • https://pianoinprimopianofestival.com/uploads/file/jepikosofopojalafigomaw.pdfIn PDF document text
    • http://wwsm-us.com/files/file/90609088047.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/5623423423.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/85713359250.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/28277902043.pdfIn PDF document text
    • http://indemo.pl/Image/files/fenewikowajapitel.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/25106260333.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/94428851520.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/18099571790.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/userfiles/fichiers/90625920371.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/26585095958.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ff841c616---nasogoxufakorebowibafug.pdfIn PDF document text
    • https://adium.ru/userfiles/file/69381432151.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/17545195433.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/zisabojovimuwawadu.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/20741678419.pdfIn PDF document text
    • http://copy-office.it/userfiles/file/50312573124.pdfIn PDF document text
    • https://mangallagn.com/images/file/vagag.pdfIn PDF document text
    • https://joinvita.com/neu/userfiles/file/65084542422.pdfIn PDF document text
    • http://kustari.net/userfiles/file/piwarawulin.pdfIn PDF document text
    • https://gionggiacam.gagiongvitgiong.com/ckfinder/userfiles/files/72047287458.pdfIn PDF document text
    • https://interconformity.ro/images/file/73656854729.pdfIn PDF document text
    • https://viceda.com/userfiles/file/82499676473.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/feliroxenaf.pdfIn PDF document text
    • http://edu-soft.ru/site/htmlimages/file/91713266246.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=work+it+movie+full+moviePDF 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_off00010833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10833 10192 bytes
SHA-256: 33720dde9918bc2daf3ec02bb1d82fbc955036e34d949c3131b4002941482e4b
font_01_sfnt_off00011f12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F12 17228 bytes
SHA-256: e0c7bce39c8e35abca7e657eeb056894123cdb79d75ddcf79fe7d1fe386e6640
font_02_sfnt_off00014bbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1