Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b9beca2ed06dae9…

MALICIOUS

PDF

82.1 KB Created: 2021-03-13 13:00:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb9cf1cd779295e1f2388af6ee2f613b SHA-1: 562e45b0513f4a1b2454ece51289389b0eca1a06 SHA-256: 1b9beca2ed06dae91f97beb23cba362a7160232e1f6750749fb810d74e9e2d5d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to redirect users to potentially harmful sites. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the presence of numerous URLs indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pelibifir.ru/aws?utm_term=canon+mx922+xl+ink+cartridges
    • http://dimax.website/revefuzakadalifu2nln5.pdf
    • https://jizenovu.weebly.com/uploads/1/3/4/6/134682428/gizora-nilatiwut-rodogede.pdf
    • https://cdn.sqhk.co/nakizenonetu/cicjheI/billie_eilish_new_song_bad_guy_lyrics.pdf
    • https://cdn.sqhk.co/wajuletixex/j2hejjq/hopper_app_not_working.pdf
    • http://spain50off.info/maweletrzplc.pdf
    • https://cdn.sqhk.co/gabixeme/fFjejjb/stylist_dress_up_styling_game_mod.pdf
    • http://venira.su/95231491333pi1hj.pdf
    • https://mixenabunagoxo.weebly.com/uploads/1/3/5/3/135320093/wuziruwefurimo.pdf
    • https://tuxutumixebapi.weebly.com/uploads/1/3/1/4/131438514/tawafaged_nenujek_tuxubuf_bujarad.pdf
    • http://remontlegko.info/easy_french_grammar_booki19xr.pdf
    • https://kojaresojew.weebly.com/uploads/1/3/4/3/134312518/5060254.pdf
    • https://viriparerari.weebly.com/uploads/1/3/5/9/135978168/fenuvetija_lapaxutirukaba_kapanexodurazo.pdf
    • http://sodaapp.club/pimesitodoloj2obtn.pdf
    • http://soldatskaya6.ru/loot_how_to_sort_load_orderpbwgx.pdf
    • https://bovuzujavus.weebly.com/uploads/1/3/5/3/135326818/5886963.pdf
    • https://tesazosutev.weebly.com/uploads/1/3/4/7/134714215/sarivavoxixofe.pdf
    • https://cdn.sqhk.co/juzosugun/g7ed5Xk/bugsy_malone_actor.pdf
    • https://cdn.sqhk.co/linotepibubi/cidBkjd/69078850841.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://00407fa8-a9ef-4b78-9bbe-46147fc8acf6.filesusr.com/ugd/5ecadc_bd62de1c7adf4f4a99ec0aaefe3efb0d.pdf?index=true
    • https://57eba762-b826-4879-8d7a-7f480aba2934.filesusr.com/ugd/e89c2b_17cd1905a20d4c938f662786dba00ed9.pdf?index=true
    • 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_off00010309.bin
4875c57f1e1fe5260904f23b4464345ce6d1f8953d5df429b6363971d336a871		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10309 5584 bytes
font_01_sfnt_off000115f4.bin
7814f814b109aabdf9375a327bdf444cf0970be37cc492c69aee637adeafd878		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115F4 10832 bytes

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