Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f98fcf7abc30f8f…

MALICIOUS

PDF

69.1 KB Created: 2021-03-24 00:24:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 20e411fcca16b4f2556de0c854d8114f SHA-1: 706105868b8ef8685dfbfab3d2f2b25d07184c4f SHA-256: 6f98fcf7abc30f8f99c138507d2e6fdaed467ec1d927108c81cd8ee83caea257
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://seumenha.ru/award?keyword=stadtplan+basel+stadt+pdf PDF link annotation
    • https://goduvozimaku.weebly.com/uploads/1/3/1/3/131380582/8294366.pdfIn PDF document text
    • https://jixejuterekafiw.weebly.com/uploads/1/3/4/5/134508928/jofavij_givixofivux_mevanisofi_lefexudejub.pdfIn PDF document text
    • https://kijagixizob.weebly.com/uploads/1/3/3/9/133997709/zexojazebefevij-lalilari.pdfIn PDF document text
    • http://mumijivamivaxij.medianewsonline.com/zizeraxutatodijesovutul.pdfIn PDF document text
    • http://yesnutural.space/basic_marketing_research_7th_edition1cm5q.pdfIn PDF document text
    • http://palubofapejuraw.mywebcommunity.org/indian_instant_pot_cookbook_free_download.pdfIn PDF document text
    • https://denosuzasagi.weebly.com/uploads/1/3/2/7/132712615/zavadaxebab.pdfIn PDF document text
    • http://copyright-rules-help.com/live_football_hd_app_android6rm8c.pdfIn PDF document text
    • http://izzzaaa.space/pixudimidezapababipekanm8uf4.pdfIn PDF document text
    • https://jevavuxenexek.weebly.com/uploads/1/3/5/3/135351486/f9ee3c53b74.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vipuzala.myartsonline.com/percy_jackson_film_3_trailer_deutsch.pdfIn PDF document text
    • http://sitafefisoju.atwebpages.com/70626957174.pdfIn PDF document text
    • https://160e4e15-e27a-4ef2-9b26-f67fc0969a86.filesusr.com/ugd/cbdbb6_2a8c9f654d484497a272346916462aed.pdf?index=trueIn PDF document text
    • https://89511c73-251b-4bee-a1a5-5f4bd4863124.filesusr.com/ugd/f24cb8_c3fbe5f09b22464a973fe2b0d1a5c454.pdf?index=trueIn PDF document text
    • http://jozobudesurarab.onlinewebshop.net/hey_siri_what_is_the_order_of_the_harry_potter_movies.pdfIn PDF document text
    • https://a5a8f6e1-24ae-425c-880d-6f4079e3c376.filesusr.com/ugd/035627_eef82c79851e435685e953d1bc5d9878.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_off0000d070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD070 5180 bytes
SHA-256: 1a5142301c1c07440593ef5b0942644158948c9e754f209d4987d67d76d7b869
font_01_sfnt_off0000e21c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21C 11516 bytes
SHA-256: d6a7924b43d02c6df3127ad7cb81a204d345e99753bdccc6a2b4c0e1eb1a3f8f

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