Malicious PDF — malware analysis report

Static analysis result for SHA-256 b59c891351d220e5…

MALICIOUS

PDF

82.2 KB Created: 2021-06-13 14:15:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: d2caa2548087a7a11956dea0c02b1e75 SHA-1: 3d1533379ea38665d1c87c1ef9058ae5f781c00f SHA-256: b59c891351d220e520ea269aa4bbca63e68eb7b006016f7e95ee1830ed3bd662
186 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic identifying it as a link farm hosted on disposable domains. One prominent URL, 'https://coretry.ru/pbw?utm_term=bhairava+tamil+movie+tamilrockers', suggests a potential phishing lure related to movie content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

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://coretry.ru/pbw?utm_term=bhairava+tamil+movie+tamilrockers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4497079/normal_5fe665482d35a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380527/normal_60c1193c74188.pdfIn PDF document text
    • https://zojezuma.weebly.com/uploads/1/3/1/3/131382028/wewumas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443809/normal_5ff8990a4a3c1.pdfIn PDF document text
    • https://xanikuxesovedew.weebly.com/uploads/1/3/4/2/134235486/b4e725fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420776/normal_602a71278488c.pdfIn PDF document text
    • https://somusepuxe.weebly.com/uploads/1/3/1/0/131070447/e2cc4a1b1b901.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://moxulolo.pbworks.com/f/smart_bracelet_m3_manual_em_portugues.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/517ca3d7-2abc-4459-bf22-632896ec304f/33751076218.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0af9f10e-01a2-49a9-a7ba-deb283d24fe1/luziliwuwarobijurosojulem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c55ad495-ae15-4fba-b0b9-5d2518ffc5b4/is_tokyo_disneyland_open_on_mondays.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7445dee-61eb-444c-8dc2-defa1c68d62a/how_much_does_a_private_investigator_cost_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0adf66d5-a2a1-47bb-972c-daac8f13f983/divuxesusa.pdfIn PDF document text
    • http://kakewizajupe.pbworks.com/w/file/fetch/144597183/najomer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05fdd7c0-833e-4b2b-aec5-df2db5cbcb36/how_old_do_you_have_to_be_to_get_your_drivers_permit_in_massachusetts.pdfIn PDF document text
    • http://jagimikat.pbworks.com/w/file/fetch/144735246/bomuxalir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6351916b-4c49-46ba-abd0-c2cec23fd259/tonenozerijutojeduv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/153ed034-9c4e-4a53-811a-b7ffce4b93bd/christmas_carol_1984_cast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69eb3e88-4381-40b3-82a6-236790a51081/family_and_friends_day_welcome_speech.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e8917fe-3772-44e8-bb11-45d58653f317/how_to_draw_flower_of_life_symbol.pdfIn PDF document text
    • http://koruzepuza.pbworks.com/f/24058630436.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c73159c1-9bb8-42b3-a618-d43fbe8ce234/kenwood_kdc_w3041_protect_mode.pdfIn PDF document text
    • http://garigor.pbworks.com/w/file/fetch/145046676/kimowuvitufalogikibif.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_off0001066e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066E 5212 bytes
SHA-256: acfea60af856208714ccb3c0e1cf385acbf5f3c6b0624e7579314f61fa30c433
font_01_sfnt_off00011801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11801 10288 bytes
SHA-256: 5f4159f935e0f686b5fd92b69775c6713a2996e5e9a36d021c2bbbda6a3ba18d