Malicious PDF — malware analysis report

Static analysis result for SHA-256 f13610fae0cc0d86…

MALICIOUS

PDF

94.2 KB Created: 2021-03-12 13:58:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 00ab310d1b687ebba76e22b5cb5fef48 SHA-1: 3615a7b1137aad98ffdb8dbe6ae08f969e4f0ca5 SHA-256: f13610fae0cc0d866905d936e6ceafb0c6a4615a101c5b263ff7de0fae103e8a
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a non-clustered link farm on disposable hosting. While no scripts were explicitly extracted, the nature of the embedded URLs and the phishing detection suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://leonvi.ru/wix?keyword=dbz+dokkan+battle+best+shenron+wish PDF link annotation
    • http://temilops.xyz/iron_kingdoms_fillable_character_sheetl3xh7.pdfIn PDF document text
    • http://giocodigital.fun/word_template_labels_21_per_pageybbls.pdfIn PDF document text
    • https://rukuzidin.weebly.com/uploads/1/3/4/5/134517246/roziliwiw.pdfIn PDF document text
    • http://tevuvisena.iblogger.org/33948791865.pdfIn PDF document text
    • https://xuzuvakewose.weebly.com/uploads/1/3/1/6/131637797/donimujurur_ruwire.pdfIn PDF document text
    • http://tujozavido.66ghz.com/83319765308.pdfIn PDF document text
    • https://kedigijolaga.weebly.com/uploads/1/3/4/3/134331451/9f75aaf7fa.pdfIn PDF document text
    • http://nipokaxa.getenjoyment.net/how_to_program_vizio_sound_bar_to_directv_remote.pdfIn PDF document text
    • http://mavurelaro.22web.org/gogasozogisukurop.pdfIn PDF document text
    • https://nofodomeki.weebly.com/uploads/1/3/1/8/131871852/2efb52b.pdfIn PDF document text
    • http://faceskinagainbeauty.xyz/vietnam_furniture_industry_report_2018joa41.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zutugidod.onlinewebshop.net/how_to_read_lexicon_ethics_for_upsc.pdfIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/best_platform_game_maker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d971b699-b511-4671-9722-c99d52cc1daf/wintv_v7_serial_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89e363fa-6018-49d6-950e-c4dd5c5205f1/zutugapizisevomativazewez.pdfIn PDF document text
    • http://pepevanuretuz.epizy.com/sirifabajawoxifowad.pdfIn PDF document text
    • http://bokepitu.rf.gd/how_to_combine_like_terms_with_powers.pdfIn PDF document text
    • https://s3.amazonaws.com/fewifuwu/rexakofibibigafikegokuxif.pdfIn PDF document text
    • https://s3.amazonaws.com/paxuvagal/12_half_yearly_maths_answer_key_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/zabevog/vufaxovi.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/zuliwa.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000115cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115CC 9560 bytes
SHA-256: 72031d517cbcffdb374b67efe12ea052a46d4912c8cf41de3cc30291ebfb40e2
font_01_sfnt_off00013513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13513 5260 bytes
SHA-256: 6a229f6f0cc923acae378d5380213df74cdc5f8e8604af9553cdb6e73a09ed74
font_02_sfnt_off0001470b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1470B 10912 bytes
SHA-256: c8593166d2d74757c51804330061ab9a68ebe985bbb2a9fe5b93aee0f5547781

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