Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f5d7d5d37669cce…

MALICIOUS

PDF

90.4 KB Created: 2021-03-10 16:24:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 99a4e366f9234a955c1535137a8a6c92 SHA-1: 837c13422e422084ff6a0ad6da5943960c388aad SHA-256: 2f5d7d5d37669ccef32be99e5ae1a56eeaa7a0bb12c095614b70fd6d854e3819
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, which is characteristic of SEO link farms or phishing lures. 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 heuristics suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://leonvi.ru/strik?utm_term=python+join+dictionary+keys+to+string PDF link annotation
    • https://cdn.sqhk.co/wobuwaseja/WLQRhik/wradio_en_vivo_video.pdfIn PDF document text
    • https://cdn.sqhk.co/lomotutuwe/d6heBh6/kill_ants_outside_naturally.pdfIn PDF document text
    • http://govakokes.22web.org/61711313986.pdfIn PDF document text
    • https://soregoba.weebly.com/uploads/1/3/0/7/130739918/8024505.pdfIn PDF document text
    • https://vipobonufemug.weebly.com/uploads/1/3/5/4/135401160/1d1a38fa.pdfIn PDF document text
    • http://fevavoke.iblogger.org/xekapobesu.pdfIn PDF document text
    • http://ragitikevuwa.22web.org/magic_chef_dehydrator_instructions.pdfIn PDF document text
    • https://cdn.sqhk.co/kekelivig/Rxjaia7/mario_kart_wii_star_slope.pdfIn PDF document text
    • https://xijafidul.weebly.com/uploads/1/3/2/3/132303061/rovipaxeloxu_wolimarenad.pdfIn PDF document text
    • https://duzopotubesafes.weebly.com/uploads/1/3/4/8/134890215/2048539.pdfIn PDF document text
    • https://cdn.sqhk.co/nodujugebi/eieEXhd/fall_guys_ultimate_knockout_mobile_apk.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/33c29d0f-5e8b-476a-b75f-08aca2618299/why_is_my_ninja_blender_power_button_flashing_red.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0934af70-e34d-47f0-be55-14790971ea29/cool_electric_guitar_riffs_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9f0d678-6365-4c8c-9a05-895ef8067d56/lobby_hero_summary.pdfIn PDF document text
    • http://kekokid.epizy.com/gesejetavewobiri.pdfIn PDF document text
    • https://6db1e9a2-4282-4636-8d41-de07325ad911.filesusr.com/ugd/d97b38_732e3b761eb843838c0c996ede5ead65.pdf?index=trueIn PDF document text
    • https://e064a861-6c7b-46af-b67a-66be1f32d776.filesusr.com/ugd/ec3e4b_f48be0e03483436c9aed14fd02241bbd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/29af6df4-da34-4336-86d9-228c46b2a119/12105653329.pdfIn PDF document text
    • https://fb9345b8-40be-4608-a8ff-9c5427dba92f.filesusr.com/ugd/98d639_649d3ee371d8424bb974e3ff31bd2657.pdf?index=trueIn PDF document text
    • https://69cf8a46-0d3d-4b71-8fd1-93df925da18e.filesusr.com/ugd/e4064d_70bf77ab3ea4411f9f50e784261f1032.pdf?index=trueIn PDF document text
    • https://77701ba7-c5ad-4750-ab17-5b03548f7fc0.filesusr.com/ugd/9a242c_2641cf4354e844bb852142fd623e6303.pdf?index=trueIn PDF document text
    • https://e082b6be-64c0-45f6-a8ff-82b9c6f476f0.filesusr.com/ugd/1479de_3c8ac09cb23644239793c62445f25e89.pdf?index=trueIn PDF document text
    • https://bd7a0a6f-bbfd-49cc-ba41-c3f2778102d9.filesusr.com/ugd/9ea91e_df0bbdc8dabb4581a0c3e828f232303f.pdf?index=trueIn PDF document text
    • https://584abdf6-e408-48d3-a53c-4313a8f82471.filesusr.com/ugd/18ee90_4573871957d74a03b381800e0328227e.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_off00011964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11964 5412 bytes
SHA-256: 0d4265cef424065aebc706bd098ff8a3adb71a97e16553ca3f9a61efff402b70
font_01_sfnt_off00012bd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD5 15424 bytes
SHA-256: e16b779ba9db9b83cbaedf324fb2fad1630e48bd645a3d58f8a85a639c6698fc

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