Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5c35a6ce184f744…

MALICIOUS

PDF

82.3 KB Created: 2021-09-18 21:14:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b2205b0de27a4cfa14009a76230e3009 SHA-1: 34600910d6e269cef6fd16783beba71a97d0c5f4 SHA-256: c5c35a6ce184f744b956c0cc717f517d697696e04c1f889e31ed8852907c586e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many pointing to potentially malicious domains, suggests a phishing or malware distribution scheme. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports this, indicating the document is designed to host many links on disposable domains. No scripts were extracted, but the overall structure and URL findings point to a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://funke.be/data/file/26736996132.pdf In PDF document text
    • http://ppfi-online.com/userfiles/file/13588140767.pdfIn PDF document text
    • http://laboratorioshamalab.com/userfiles/file/bujupirajilugameziwulujop.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613752df887d7---fojatilikoledisejegij.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/muraxifotasaliz.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/tikufini.pdfIn PDF document text
    • http://goodmax.ru/i/files/wujef.pdfIn PDF document text
    • http://graczeonline.pl/userfiles/file/lujupegujatuduxubiwajuf.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/22207573225.pdfIn PDF document text
    • https://serka.com/serka/upload/files/jakuwuduvokemar.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/gazep.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/ragokazapusunupixaper.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/tegemosopebufuboramokud.pdfIn PDF document text
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jagejuro.pdfIn PDF document text
    • https://apartmani-mestrovic-krk.hr/files/94410543583.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/5057139172.pdfIn PDF document text
    • http://101eyewear.com/luutru/files/46546092730.pdfIn PDF document text
    • http://ateliergermain.org/sites/default/files/file/xofajelitowedaka.pdfIn PDF document text
    • http://maremania.net/img_pagine/file/71873069288.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/8ae9185689f8060907a363c3a13f1deb/84054088207.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/25967874682.pdfIn PDF document text
    • http://globalsublimation.net/uploadfile/files/derobofitivizanefivata.pdfIn PDF document text
    • http://mastervgtour.by/var/upload/file/24823503365.pdfIn PDF document text
    • http://slovoveri.org/userfiles/wajovigilit.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/kiwisuxivadixegubafeved.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=gba+roms+for+john+gba+litePDF 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_off0000db37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f34e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34E 10972 bytes
SHA-256: 0367226527d678a16fcfe5b3b25929f75d104b6c4662e670de9d4e466d72f9bc
font_02_sfnt_off00010c94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C94 18080 bytes
SHA-256: 9d95034651f36ffbc65385a18ada45d0d1d2a451e2bcfe4547e75a899ad856f9