Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d1b310cf324ad38…

MALICIOUS

PDF

77.2 KB Created: 2021-04-02 17:53:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5111de5f35859afbf6038e3c883bfc13 SHA-1: d0139709b8738e7aa89a468b9a0324aa345fea40 SHA-256: 3d1b310cf324ad38d7d2bf48290cea2bacb40026b830cab04dd757f6c2f6e0c4
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a large number of external links, suggesting a link farm or SEO manipulation tactic. The document body is heavily obfuscated and unreadable, but the presence of external URIs and the PDF_SEO_LINK_FARM heuristic strongly suggest the intent is to redirect users to malicious websites or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/award?keyword=present+perfect+form+exercises+pdf
    • https://cdn.sqhk.co/melipetoluf/ginU1gd/point_slope_form_equation_calculator_with_two_points.pdf
    • https://rofokaragi.weebly.com/uploads/1/3/2/8/132815015/3038038.pdf
    • https://dopotalufiru.weebly.com/uploads/1/3/4/6/134601398/4788430.pdf
    • https://subokolabipu.weebly.com/uploads/1/3/2/3/132303028/5345857.pdf
    • https://bosaralox.weebly.com/uploads/1/3/4/6/134608385/nuzemix_buzuko.pdf
    • https://tekudijasefemo.weebly.com/uploads/1/3/2/7/132740256/f9d0d05b38f471.pdf
    • https://minufagotokuwak.weebly.com/uploads/1/3/4/4/134489045/bdd7da5d.pdf
    • https://cdn.sqhk.co/kuniremolu/bahhlhh/nofomegewimo.pdf
    • http://nefupanono.mygamesonline.org/86667631208.pdf
    • https://jowajasodosetu.weebly.com/uploads/1/3/4/3/134308851/zoguvoji_nuwolevirulave_bosujezafisip_lazab.pdf
    • https://bosuzegenelulu.weebly.com/uploads/1/3/4/1/134131522/6657833.pdf
    • https://xajapeni.weebly.com/uploads/1/3/4/3/134341300/witeluxakafafukole.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/bdccc94b-51ca-4c8f-bfbd-affb5b9fac8c/htc_sensation_xl_factory_reset.pdf
    • https://uploads.strikinglycdn.com/files/fc2934e9-646b-4be4-80d8-c74e53352ec9/48907086779.pdf
    • https://s3.amazonaws.com/xakusineba/59626545928.pdf
    • https://s3.amazonaws.com/memobofilenabon/aww_tera_happy_birthday_song_pagalworld.pdf
    • https://uploads.strikinglycdn.com/files/f7826684-de62-41dc-a43f-7c2b17166221/engineering_mechanics_statics_solutions_7th_edition.pdf
    • https://uploads.strikinglycdn.com/files/cea82d7b-74e3-4a77-b63f-cf5cbd865163/20601762598.pdf
    • https://s3.amazonaws.com/pafiganovavi/66724088488.pdf
    • http://moxadokikubod.onlinewebshop.net/jezadugesaruxadimuvoku.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0f1.bin
083d708a847fb46a946aa39fbead0ea5b2e9a32f803e43cecad8542a9969132a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F1 5128 bytes
font_01_sfnt_off00010257.bin
951a10a2c5ae85d128199d2c34333dc91ff2dac8cf644d5df2c68391c5c955e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10257 10764 bytes

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