Malicious PDF — malware analysis report

Static analysis result for SHA-256 0be1b68819db9776…

MALICIOUS

PDF

79.0 KB Created: 2021-03-23 11:32:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: cc1b698a50720d016450a1bf6840a6cf SHA-1: 0c7c5fd6748473799cebdaba638bf7b7e17c7190 SHA-256: 0be1b68819db97761edf57516eeacec247ac6c03604afc92cbb9e2b82a8271ff
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to direct users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous URLs are indicative of a malicious campaign.

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://baarspo.ru/award?keyword=belt+and+road+initiative+upsc+pdf PDF link annotation
    • https://cdn.sqhk.co/vobipibomuk/Cjdsgfy/57441872540.pdfIn PDF document text
    • https://cdn.sqhk.co/mevazasid/hjzeLgh/canary_yellow_apple_watch_band.pdfIn PDF document text
    • https://cdn.sqhk.co/tefebenum/4Ghgq2r/crunchyroll_premium_apk_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/dameseri/gdnjaYT/tajejedeg.pdfIn PDF document text
    • https://cdn.sqhk.co/muligumixe/EhdJyX9/32509005392.pdfIn PDF document text
    • https://cdn.sqhk.co/gavezexu/iaiegdT/zombie_killer_game_hack_download.pdfIn PDF document text
    • https://cdn.sqhk.co/kufagilan/WfjbPhf/green_pepper_nutrition_data.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1d812fcc-cfc3-4558-a870-56fc5b7f4c2e.filesusr.com/ugd/754d94_944fef521ec340f3bddead37b85f4add.pdf?index=trueIn PDF document text
    • https://506dbbd1-d4b3-44b1-a4c9-6b5d0cab6a23.filesusr.com/ugd/c75f60_e911499378c443908988dbeb53eb1d25.pdf?index=trueIn PDF document text
    • https://ffcd7f67-9b43-45c2-8e44-b15cca9583b8.filesusr.com/ugd/48bf55_da66b996c9674486832f484df13945d0.pdf?index=trueIn PDF document text
    • https://29159626-56e2-4eb2-a8c1-eb081f451e44.filesusr.com/ugd/a58502_f7f37b38a19f45c1998b52ffcbdd4649.pdf?index=trueIn PDF document text
    • https://8eeb1f0a-0cdd-4c66-98a4-83777b49fb54.filesusr.com/ugd/64f9d2_b5f1c1c02b754b3b8a93492da0e82aa5.pdf?index=trueIn PDF document text
    • https://13a7c488-548c-4b48-b567-d2b0b9a3e1de.filesusr.com/ugd/85d67f_884e509ca4f840e3ab02884877fe0604.pdf?index=trueIn PDF document text
    • https://cee4a208-09ac-40e0-983f-4c2cc776acbe.filesusr.com/ugd/5ed537_fe8d5420cd2d465cb5b9eb86c2568957.pdf?index=trueIn PDF document text
    • https://8318a6b7-e0bb-4247-bff5-57c3e3b2654c.filesusr.com/ugd/7a11b0_1258f62f0417424284bb90bf5717aac1.pdf?index=trueIn PDF document text
    • https://b19b3b79-9ae2-4e99-9b16-ef32671d60f4.filesusr.com/ugd/0bc867_6689968fecff4821a003a06a6b6ed1cd.pdf?index=trueIn PDF document text
    • https://c3373aeb-ed74-4f2d-b631-fa679e0a3f6f.filesusr.com/ugd/cbe7f7_fbf81654dee3491fbcad457436d607f6.pdf?index=trueIn PDF document text
    • https://bcd7deca-fd5d-492b-a220-d373ca515bc9.filesusr.com/ugd/12f4eb_c3921eda54c14a8993e21060fa4311be.pdf?index=trueIn PDF document text
    • https://1b53f64c-3596-40ff-86ea-95cec8902569.filesusr.com/ugd/838e7e_9341b5a4d15343d1ac9ca301faeb2bf8.pdf?index=trueIn PDF document text
    • https://e082b6be-64c0-45f6-a8ff-82b9c6f476f0.filesusr.com/ugd/1479de_14c1072bceb74353a6eb8d1f68151062.pdf?index=trueIn PDF document text
    • https://2ddedb0e-b7b0-41c9-a8bc-c018bd0e6e4c.filesusr.com/ugd/70094d_0090a108f9774d4880fcc50124cd7b67.pdf?index=trueIn PDF document text
    • https://850a36a1-966c-46c3-86ed-e15bcb5778a7.filesusr.com/ugd/ede58b_e47787605045400fad9deca3afcbd23e.pdf?index=trueIn 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_off0000f4b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B9 5256 bytes
SHA-256: 3a7ecf83f7afcde725d2446a0a1304187f3c34f5443da4509e5c0132a94e3493
font_01_sfnt_off000106b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B6 11304 bytes
SHA-256: 835826f4fed625181284b4b63a4cedc7181eff39943c11d9ee4d37027badfdce

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