Malicious PDF — malware analysis report

Static analysis result for SHA-256 f13c33319480b310…

MALICIOUS

PDF

73.4 KB Created: 2021-03-20 01:55:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 8e9326b6bdd59ce4a9126529def816ec SHA-1: 181d2779f6330ec75ef9dcc9026389356f2819e0 SHA-256: f13c33319480b310aadf0b393723bbef4a4be96d14b340d86143268d8994e406
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are SEO-optimized and point to potentially malicious content, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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/wix?keyword=mitosis+exam+questions+and+answers PDF link annotation
    • http://tobufasir.iblogger.org/puxaze.pdfIn PDF document text
    • https://cdn.sqhk.co/redupalulaxo/hgjjcIw/fuboxipi.pdfIn PDF document text
    • https://cdn.sqhk.co/juvanejejuwo/a7e1GwJ/86416813492.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503214/normal_5fc6b8cca4067.pdfIn PDF document text
    • https://cdn.sqhk.co/nimabugokofa/2hjsieF/pojikumase.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455645/normal_5fefe0b7a45d2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488349/normal_5febd28c56c94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480735/normal_5fe6475244c90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451575/normal_604cba5aab71f.pdfIn PDF document text
    • https://cdn.sqhk.co/jomonufo/phfCIUj/xigomezofiwebexir.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7404da97-7fcf-4d5f-9d5f-3f8644e6773a.filesusr.com/ugd/35f767_6d321157ee2d4c0f84e46ffab9b0937c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dixaleko/8535414890.pdfIn PDF document text
    • http://vabanenutulaki.rf.gd/gasolonewabewinod.pdfIn PDF document text
    • https://s3.amazonaws.com/pokorevalaxex/56043029972.pdfIn PDF document text
    • http://nexuvojof.epizy.com/11235491724.pdfIn PDF document text
    • https://s3.amazonaws.com/lusabifef/what_is_the_difference_between_pokemon_red_blue_green_and_yellow.pdfIn PDF document text
    • https://s3.amazonaws.com/tevigotu/32779029083.pdfIn PDF document text
    • http://zalezir.epizy.com/agneepath_movie_song_pagalworld._co.pdfIn PDF document text
    • https://9eb5ee95-128e-4115-bcd6-d8db8525ce49.filesusr.com/ugd/9904c2_b9bbc7b0a330477b89b3134fdac74356.pdf?index=trueIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE171 5232 bytes
SHA-256: 783d9e84072e6ed10737355fd113149d0f7bba20201eebf72c7bfe3a34cfceba
font_01_sfnt_off0000f33e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33E 10996 bytes
SHA-256: 1c2ec03954ae15f43fad4e56321e54c5e9929c68e90abf67ea08058c52c3708b

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