Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef32a5d41a236d86…

MALICIOUS

PDF

78.1 KB Created: 2021-03-03 11:27:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9fdf8c46cfb9c5000726df8ce1b285be SHA-1: d69af6f40d378c8c94f8d41c3167214c124a608b SHA-256: ef32a5d41a236d863e6040995ee5deade806efcef13d5a3277d6422b3af57729
186 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external links, including one that appears to be a search query for 'where to buy stackable washer and dryer'. The document's structure and the presence of many disposable hosting links suggest an attempt to manipulate search engine results or redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://jacksth.ru/award?keyword=where+to+buy+stackable+washer+and+dryer PDF link annotation
    • https://junimadegerozo.weebly.com/uploads/1/3/4/0/134096607/669cc989257f.pdfIn PDF document text
    • http://pubifirona.22web.org/amoureux_de_ma_femme_2018.pdfIn PDF document text
    • https://cdn.sqhk.co/jidulopavoji/jfGIrjg/heart_healthy_cod_fillet_recipes.pdfIn PDF document text
    • https://cdn.sqhk.co/vabalogu/gcfljgo/walelolepufix.pdfIn PDF document text
    • https://xonarupitowij.weebly.com/uploads/1/3/4/6/134617661/f5f1b.pdfIn PDF document text
    • https://xiliperudal.weebly.com/uploads/1/3/3/9/133999468/filivob.pdfIn PDF document text
    • https://sesupukaxupasi.weebly.com/uploads/1/3/1/0/131070911/retumexutazajuwo.pdfIn PDF document text
    • https://pelabomorifij.weebly.com/uploads/1/3/4/6/134628360/tavew_kutuxupubawulip_xobamavuf_bidexokefivir.pdfIn PDF document text
    • https://nipixosawapur.weebly.com/uploads/1/3/1/1/131164079/rokorodepibuve-xudubiwowani-kevexanu.pdfIn PDF document text
    • https://webegerux.weebly.com/uploads/1/3/4/7/134759049/buxodaxulob.pdfIn PDF document text
    • https://pevusipifo.weebly.com/uploads/1/3/4/8/134863194/pinoxob-joxire-ribekadezuti-weseloxufej.pdfIn PDF document text
    • http://likedizar.medianewsonline.com/what_are_the_five_operations_performance_objectives.pdfIn PDF document text
    • http://lulopoboxefon.scienceontheweb.net/what_is_a_blue_jacket_in_the_navy.pdfIn PDF document text
    • https://lukafove.weebly.com/uploads/1/3/4/6/134655473/febefesilux.pdfIn PDF document text
    • https://gesimuto.weebly.com/uploads/1/3/4/6/134685476/7234724.pdfIn PDF document text
    • http://zitokujamu.mypressonline.com/captain_underpants_full_movie_download_480p.pdfIn PDF document text
    • https://tujezagen.weebly.com/uploads/1/3/4/7/134775207/fidezeg-tavilujimolu.pdfIn PDF document text
    • https://ledejikijosud.weebly.com/uploads/1/3/1/6/131607919/difovawelok.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://madepadejatutof.onlinewebshop.net/bewexukonoxulavem.pdfIn PDF document text
    • http://pivimufe.atwebpages.com/78842909232.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF501 5436 bytes
SHA-256: 4b63e15cbd478b41f975e545bdff469c6ec41e975fc4676906cfc9466def59ba
font_01_sfnt_off00010793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10793 10264 bytes
SHA-256: 3327f6d4c6854d636bbcdd9fad29edf0cde9938922f7343fe16b84eeffc449a4

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