Malicious PDF — malware analysis report

Static analysis result for SHA-256 94b7c39999966d1b…

MALICIOUS

PDF

85.1 KB Created: 2021-06-01 13:37:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 1eb7a067bcbe1466075135d6fff2306c SHA-1: d24c86577619d6ad3f3ad973e38b1c0653af6b4a SHA-256: 94b7c39999966d1beb89d95c1fb558ce6d7511c5edf15869e44b49f9be16d6e8
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were extracted, the presence of external URIs and the link farm heuristic suggest the document's purpose is to redirect users to potentially malicious websites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://ketchas.ru/pbw?utm_term=biomol%25C3%25A9culas+org%25C3%25A1nicas+sales+minerales+ejemplos PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470389/normal_6065c3e78fe04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460966/normal_606648540aefc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410462/normal_6020345c11700.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500677/normal_60663e0e4fa03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413236/normal_601e8191e52ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369794/normal_6011ce7c52474.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368265/normal_5fc9378f8aca2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381098/normal_606c1f43c86ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379854/normal_601848adae627.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tagexoba.pbworks.com/w/file/fetch/144422664/gozivix.pdfIn PDF document text
    • http://togiwuvoze.pbworks.com/f/120477181.pdfIn PDF document text
    • http://supatibu.pbworks.com/w/file/fetch/144418101/what_is_inner_transition_metals.pdfIn PDF document text
    • http://kapetipubi.pbworks.com/f/can_i_get_more_emojis_for_android.pdfIn PDF document text
    • http://vugufosenene.pbworks.com/w/file/fetch/144446802/htet_2020_syllabus_computer_science.pdfIn PDF document text
    • http://zowonixepor.pbworks.com/f/91194720705.pdfIn PDF document text
    • http://mepijewaj.pbworks.com/w/file/fetch/144426642/77595270478.pdfIn PDF document text
    • http://lugozamuxika.pbworks.com/w/file/fetch/144411963/58717030802.pdfIn PDF document text
    • http://lekuzax.pbworks.com/f/34748203989.pdfIn PDF document text
    • http://naxoxututal.pbworks.com/w/file/fetch/144443070/sun_joe_xtream_pressure_washer.pdfIn PDF document text
    • http://gifavipa.pbworks.com/f/13431116996.pdfIn PDF document text
    • http://zopujoxobug.pbworks.com/w/file/fetch/144411441/how_to_write_a_break_even_analysis.pdfIn PDF document text
    • http://japomajuxire.pbworks.com/w/file/fetch/144442221/chamberlain_liftmaster_41a5021-1f_remote.pdfIn PDF document text
    • http://zikupuzajix.pbworks.com/w/file/fetch/144432468/91783628025.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_off000109c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C8 5752 bytes
SHA-256: aebdc02581c0737e7d722f7d59ca737df8e4a47ceb480b62ca23a07402837b0f
font_01_sfnt_off00011c6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6B 12220 bytes
SHA-256: 2603ffd511b143667ca76f9069a618d73b4bdf7e68aa56589553be72c4cc3b8e

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