Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa2424202a7ce242…

MALICIOUS

PDF

79.3 KB Created: 2021-04-29 12:24:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ec705a3ef8b681bfc23bb430fc9a204a SHA-1: 1cf032b95ec3cd50bb64bd68e145418a4e1d9773 SHA-256: aa2424202a7ce24205dc9edd4fda2a330934128de080a680289f395fcbad91c9
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 0.9997

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/strik?utm_term=accu-chek+nano+test+strips+walmart PDF link annotation
    • http://lasabobobatir.22web.org/50931566508.pdfIn PDF document text
    • http://kavelokafozi.medianewsonline.com/68688600721.pdfIn PDF document text
    • https://silukirajewulo.weebly.com/uploads/1/3/2/6/132695932/1297472.pdfIn PDF document text
    • https://rowopubogapog.weebly.com/uploads/1/3/4/2/134234702/pureginaz.pdfIn PDF document text
    • https://kajubogoxin.weebly.com/uploads/1/3/0/9/130969430/jituvaj-bituxapetita-jonuni.pdfIn PDF document text
    • http://dipenoguzel.sportsontheweb.net/62517265961.pdfIn PDF document text
    • https://gizazegixewaner.weebly.com/uploads/1/3/4/5/134596748/5e750961fc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://refipazak.epizy.com/fatarifijudomopes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fe3fe91-6307-464d-8f76-35ac50c7d0a7/how_many_books_are_there_in_artemis_fowl.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a0315b3-da74-473e-b806-e34fa43cd768/suzuvuzozesisilobib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd5746f9-7e6c-49bb-9af2-1800d75ec40c/rapikolat.pdfIn PDF document text
    • http://fuxunowelujuxa.atwebpages.com/53532119057.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3211bbee-7c2a-413d-ac0e-2cf11306df03/angelcare_deluxe_baby_monitor_ac401.pdfIn PDF document text
    • http://xanawuvogi.epizy.com/apertura_comercial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ec8165f-1588-4031-b40e-46bf137e4837/53484274523.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83b7baab-d567-4259-bb9d-0baa0f7e31b6/timex_alarm_clock_t121x.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3fcc83b-2803-42c5-9a1e-baebf204589b/revofiviwelaguguva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ff3ccb7-d561-4997-a268-3bb7ca4068f7/victoria_secret_employment_requirements.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c165909-9c8b-4d57-8dea-916ecc3ea924/discipleship_meaning_dictionary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adb6cdda-6942-48c5-89ba-819d6400b96e/singer_hd_4411_vs_4452.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1480b45a-a6b3-4502-b127-202ab873cf52/watchmen_comic_chapter_summary.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_off0000f622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF622 5348 bytes
SHA-256: 5a670fed05b667fd8e2bec37561051c8dbc3b09e9b13f0922f4485b91401d172
font_01_sfnt_off00010840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10840 11672 bytes
SHA-256: 9cb4488de0b48cef11a061967e440c296d5d1233fdccbcf8b64c2dddff65099a