Malicious PDF — malware analysis report

Static analysis result for SHA-256 c733c5b45f8a9564…

MALICIOUS

PDF

77.7 KB Created: 2021-05-04 17:13:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 380b99559de5afac1226ebe347d551f1 SHA-1: ca575adec81c4799edd3c0b53e6971314f686c20 SHA-256: c733c5b45f8a95641a61b85522c248eea7352994e1e4932885a196d7b991ced1
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable hosting and are flagged as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, appears to be a lure related to a search query, directing users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://midufefew.ru/strik?utm_term=which+kind+of+weathering+creates+karst+topography PDF link annotation
    • https://popupobapovuzus.weebly.com/uploads/1/3/4/0/134012290/bakabogatoxubafu.pdfIn PDF document text
    • http://balegetiwep.mywebcommunity.org/18592954560.pdfIn PDF document text
    • http://fobativ.mywebcommunity.org/accounting_principles_book_16th_edition.pdfIn PDF document text
    • http://fkpravo.ru/what_is_the_marine_corps_leadership_philosophy_characterized_bygpk61.pdfIn PDF document text
    • http://lnstagram-blue-ticks.com/16264105320yxfe8.pdfIn PDF document text
    • http://tugrull.com/gesajimejuvanewigolokexej2p89a.pdfIn PDF document text
    • http://italiabeach.space/4565197152l5374.pdfIn PDF document text
    • http://powajaxib.medianewsonline.com/albay_forever_lyrics.pdfIn PDF document text
    • https://fosobezi.weebly.com/uploads/1/3/4/8/134898374/fazubo.pdfIn PDF document text
    • https://gerugufudob.weebly.com/uploads/1/3/4/8/134869234/4338687.pdfIn PDF document text
    • https://fogujudusimasob.weebly.com/uploads/1/3/4/7/134713994/voweboli.pdfIn PDF document text
    • http://ru-en.xyz/vasusi2dj8t.pdfIn PDF document text
    • http://zozavelomidabi.scienceontheweb.net/75404274617.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kubomefewofumim.atwebpages.com/administrao_de_micro_e_pequenas_empresas.pdfIn PDF document text
    • http://guriseb.myartsonline.com/vocalise_violin.pdfIn PDF document text
    • http://rinimodosejowuf.myartsonline.com/40775306335.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/193b5d4d-772a-464d-80ff-97f503f45305/85786929960.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48f6a9cf-415f-4554-8676-594cc2b889dc/characters_in_red_queen_book.pdfIn PDF document text
    • https://s3.amazonaws.com/jenagubadopi/how_to_stop_a_first_alert_smoke_alarm_from_beeping.pdfIn PDF document text
    • https://s3.amazonaws.com/jigezilor/how_to_run_a_quicker_5km.pdfIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/dark_souls_3_dex_build_pve_stats.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc92a35e-d1af-43eb-86a8-929c762ddc25/cuantos_libros_tiene_la_biblia_cristiana_en_total.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_off0000f0d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D9 5656 bytes
SHA-256: c0d899a84298ec2414bb4e5a02fc705e69b48b67f3bd3cf42e40f89dccd73e90
font_01_sfnt_off0001043a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043A 10972 bytes
SHA-256: cacb6ad59bd3fd7a3f98c217646a4e547ebe311005d05f81d46f5dbd78e1e79d

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