Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aa78c6233d90915…

MALICIOUS

PDF

76.4 KB Created: 2021-03-22 02:45:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 3963f56065b1807735317093eb520c6d SHA-1: d0a467a68d7ecca9a46b78b7e5e8cb0deff8e275 SHA-256: 9aa78c6233d90915b9c817b1927b2f1c30c6b42deab1ec95d38049965c626ed0
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs pointing to other PDF documents, suggesting a phishing or malware distribution scheme. The presence of a 'utm_term' parameter in one of the URLs hints at tracking user acquisition, common in phishing campaigns.

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://lozipotod.ru/123?utm_term=google+play+store+dark+mode+android PDF link annotation
    • http://vikiduxa.mywebcommunity.org/buffer_equation_and_buffer_capacity.pdfIn PDF document text
    • https://cdn.sqhk.co/xosaletozobi/jjNkijU/black_demon_slayer_guide_osrs_2018.pdfIn PDF document text
    • http://tezijexipilimo.getenjoyment.net/nereredepixirajativoxog.pdfIn PDF document text
    • http://xuribof.medianewsonline.com/jesibufu.pdfIn PDF document text
    • http://sitebomobegux.sportsontheweb.net/what_is_the_order_of_the_harry_potter_series_movies.pdfIn PDF document text
    • https://cdn.sqhk.co/nogorodizet/fibVgfW/7712928911.pdfIn PDF document text
    • https://cdn.sqhk.co/tudobele/jFjbPjh/moviepass_alternatives_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/dufelogaruf/gcFzigc/37497161141.pdfIn PDF document text
    • https://cdn.sqhk.co/fewoxenovof/dLY8wJv/stickman_shooting_games_unblocked.pdfIn PDF document text
    • https://cdn.sqhk.co/nemoludajedu/chigika/advanced_hepatocellular_carcinoma_icd_10.pdfIn PDF document text
    • https://cdn.sqhk.co/wogokodu/jalfNig/music_racer_nintendo_switch.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0e818273-c791-4c7a-b20f-750474b78fe4.filesusr.com/ugd/362633_f9decf571e4e446795b28a6e59b68956.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f6a9ca5-11cc-4e7e-8f87-81549789febc/54658277951.pdfIn PDF document text
    • https://19508648-7f28-415f-8121-b57715dc1465.filesusr.com/ugd/9734e7_206067cb4be34d5eb8da73c76753edb3.pdf?index=trueIn PDF document text
    • https://f200304d-316b-45a9-b05c-680123ec6d1a.filesusr.com/ugd/aad1a2_1bad018705934acdbd8836ae84475c87.pdf?index=trueIn PDF document text
    • https://28546a20-d0cc-4b82-bb4f-6711990cd5a3.filesusr.com/ugd/0bcf16_6e02135fa5c5431c885060ce47038115.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/dus_bahane_song_djpunjab.pdfIn PDF document text
    • https://165abacb-5525-4e66-971c-c167d859e756.filesusr.com/ugd/f3f2a5_fdea33cc296f4b0795e0501fa44d8b8c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4dbc34a3-9b74-4244-945f-4519780cd94c/rifts_rpg_dimension_books.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b3a13c6-2b3f-46bc-9bae-074a1e44034a/79602641047.pdfIn PDF document text
    • https://s3.amazonaws.com/xunilukegez/busizonameraxudugilo.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_off0000eae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE2 5476 bytes
SHA-256: 0ed3694ba3f8b795225ee73c53ea398da929d6543f545cf05cccd16393b6cd11
font_01_sfnt_off0000fd80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD80 10868 bytes
SHA-256: 2fc1a2de4a1712cb189420feb02b5533c4c4b2a2969278932820e8dcecccbf4a