Malicious PDF — malware analysis report

Static analysis result for SHA-256 67ec1ad0de4b33fb…

MALICIOUS

PDF

74.3 KB Created: 2021-03-20 04:20:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: cb6296b5fbf8022a6010a0330b269d52 SHA-1: 21671f6fc61fb5357b8e7b6b680c57c56542fafb SHA-256: 67ec1ad0de4b33fbacdb511c2267a9b4ca97dd3e1d25043aa6e383461e93bb7e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF containing numerous embedded URLs, many of which point to disposable domains and are flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://pelibifir.ru/wix?keyword=wpa+outcomes+asu PDF link annotation
    • http://mokuduvejevuz.scienceontheweb.net/28541246936.pdfIn PDF document text
    • http://falozuk.22web.org/15516239250.pdfIn PDF document text
    • http://websporizle3.com/stylesheet_not_working_node._jsrbhaz.pdfIn PDF document text
    • http://alexandreablog.com/what_are_words_that_end_with_lysisv0hl4.pdfIn PDF document text
    • http://soxexuv.iblogger.org/lejuzojonologukatobofodog.pdfIn PDF document text
    • http://storeplus.pro/cisco_linksys_e2500_range_extendernxe9c.pdfIn PDF document text
    • http://ipoteka.net/effects_of_hyposecretion_of_adhnclyz.pdfIn PDF document text
    • https://dojobojijiwum.weebly.com/uploads/1/3/2/6/132681334/391b721743.pdfIn PDF document text
    • http://gta-msk.ru/53760771115o8e3q.pdfIn PDF document text
    • http://dvertsoff.ru/2938296308jyjv2.pdfIn PDF document text
    • https://fitinunajixir.weebly.com/uploads/1/3/1/6/131637477/bevol.pdfIn PDF document text
    • http://nefritthebestthing.site/64174652244d4men.pdfIn PDF document text
    • http://rafavutatejo.iblogger.org/73241598441.pdfIn PDF document text
    • http://nonly.xyz/how_to_find_calories_on_food_labelscsfe8.pdfIn PDF document text
    • http://ketotreno.buzz/55643655631phpyf.pdfIn PDF document text
    • http://nanukokopetip.iblogger.org/adda_247_ace_english_book.pdfIn PDF document text
    • https://tesetugunujogub.weebly.com/uploads/1/3/4/0/134040467/mewikibezojim.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tubukeganuji/mixupelutejapemuwofakige.pdfIn PDF document text
    • https://s3.amazonaws.com/nevowimo/mutexutenazomuve.pdfIn PDF document text
    • https://s3.amazonaws.com/dogevazapiwediw/local_guide_level_rewards.pdfIn PDF document text
    • https://s3.amazonaws.com/sobaketemu/84400938425.pdfIn PDF document text
    • http://dowafirowelumex.atwebpages.com/29420074030.pdfIn PDF document text
    • http://rewuwuja.onlinewebshop.net/30420342169.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_off0000e7f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F0 4964 bytes
SHA-256: 1f95de3c08535512d70a88c0c0de8d2607788b5e4f8e4e11c9d9e28d30224b84
font_01_sfnt_off0000f8cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CF 10408 bytes
SHA-256: 911055708290e06073c8f22bdc750c23feef2bdda21e566c90d0038ce50d6382

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