Malicious PDF — malware analysis report

Static analysis result for SHA-256 f451d7c89b210847…

MALICIOUS

PDF

77.8 KB Created: 2021-03-25 16:08:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 08536d21a97c436b923739f8e7c68e66 SHA-1: 59f0e9efb15177a18707cd83704d0ce00a84fec8 SHA-256: f451d7c89b2108473f859e97a80dcaf8f5fe66a876707cc3e4cc59cc9cbc0e2b
126 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous embedded URLs, with at least one, 'https://zajinet.ru/123?utm_term=static+lunges+form', being flagged as a potential redirection to a link farm. The PDF structure and embedded content suggest it's intended to lure users to external, potentially malicious sites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/123?utm_term=static+lunges+form PDF link annotation
    • http://uuuuull.space/bowflex_sport_workout_videoa2g2v.pdfIn PDF document text
    • http://nezatarofarix.getenjoyment.net/netherlands_railway_map.pdfIn PDF document text
    • http://boost-shop.xyz/horde_leveling_guide_1-_110uvlu1.pdfIn PDF document text
    • http://argo-tourism.com/free_illustrator_flyer_templateslcrdc.pdfIn PDF document text
    • http://fiwupejebibogu.sportsontheweb.net/japud.pdfIn PDF document text
    • http://info-pages.ru/40570266488a2304.pdfIn PDF document text
    • http://dvertsoff.ru/aggiornare_app_android_tvon0jo.pdfIn PDF document text
    • http://pearhaidhr.fun/78936705945c3hzr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/673aa1fc-66db-4ef7-b473-aa4f0d110ac8/lexus_es_300h_reviews_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fd26f3d-afa5-435f-a93f-db639742f38d/first_things_first_song_imagine_dragons_download.pdfIn PDF document text
    • https://s3.amazonaws.com/vebisop/lukinenixezulawunetil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9be3d28-8a97-4f4e-9e6b-e6d249cff4fc/2002_ford_explorer_sport_trac_transmission.pdfIn PDF document text
    • https://s3.amazonaws.com/pivetuzadujo/wasulil.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxagixil/is_trane_more_expensive_than_american_standard.pdfIn PDF document text
    • https://s3.amazonaws.com/mokamoba/58249721996.pdfIn PDF document text
    • https://s3.amazonaws.com/zuniverijesud/80195235130.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6236cc95-d321-4023-a423-c6c4c3a71eaa/metowojokubovu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f61e15ae-ddca-42cb-ba9d-2f332b20b602/what_is_the_main_idea_of_president_kennedys_speech.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA05 5304 bytes
SHA-256: b5ab470b3268f7bb537480086477b56bdb29f7b2231df409bb6e16ce49529b91
font_01_sfnt_off0000fbf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF4 2140 bytes
SHA-256: a1c68180eae955d710b1f59d89b7b5bb1f22246194deffa7b9c3298859733f9b
font_02_sfnt_off000105cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CC 10608 bytes
SHA-256: 755c0652c404e24db94c90cc04c60fd4af00cfa1cb72c7c5d87d929276087f8b

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