Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ae3f82cbb5182aa…

MALICIOUS

PDF

84.4 KB Created: 2021-05-08 13:11:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 64d10144798ec7429cb1edef27790b73 SHA-1: e7a20cd7e03798cdeedfa69521adf6bf01f5da93 SHA-256: 7ae3f82cbb5182aa260e0b3d1eaa3d1f8343204b9f954c090a35be127b9692b7
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of the primary external URIs points to 'crophysi.ru', which is likely part of a phishing or spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the structure suggests a phishing or spam lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://crophysi.ru/strik?utm_term=honda+cr+v+automatic+transmission+fluid+change+cost
    • https://cdn-cms.f-static.net/uploads/4375541/normal_60183bce0f4e5.pdf
    • https://miwuzuxatidako.weebly.com/uploads/1/3/0/7/130775980/geforiwe.pdf
    • https://fikobovivinuzo.weebly.com/uploads/1/3/0/7/130739062/gukutorojo-puvawavateb-kasolexiroxe-kelovat.pdf
    • https://cdn.sqhk.co/luxanimev/fgwakge/59133161365.pdf
    • https://static.s123-cdn-static.com/uploads/4486351/normal_5fcdb4c6ab6c7.pdf
    • https://static.s123-cdn-static.com/uploads/4504047/normal_5fe15b0cc621e.pdf
    • https://cdn.sqhk.co/kutajanode/fggijia/40709914610.pdf
    • https://turexebino.weebly.com/uploads/1/3/4/2/134265835/383e2305c9f93.pdf
    • https://cdn-cms.f-static.net/uploads/4366366/normal_603e72b08579f.pdf
    • https://cdn-cms.f-static.net/uploads/4455876/normal_6044f9be74d7f.pdf
    • https://pigukoziluluz.weebly.com/uploads/1/3/4/8/134896600/2930339ea.pdf
    • https://galovuxo.weebly.com/uploads/1/3/4/7/134760431/d432028b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/26467a53-ee53-485f-a605-ad90725df3e5/jijilu.pdf
    • https://uploads.strikinglycdn.com/files/3579bc2d-53b6-4e13-a996-605e19c0e6d7/mubutoxelowikivosime.pdf
    • https://uploads.strikinglycdn.com/files/7dd62080-6153-48b5-9130-805a8ec86e63/how_to_program_dish_hopper_remote_for_tv.pdf
    • https://uploads.strikinglycdn.com/files/9379cb3a-09f9-4336-8f5c-e748393a0b29/old_yeller_movie_dog_breed.pdf
    • https://uploads.strikinglycdn.com/files/9fa73919-48cb-4f2b-a1da-f5e73f070005/ariens_5520_snow_blower_owners_manual.pdf
    • https://uploads.strikinglycdn.com/files/ed78456b-820e-4e98-9e99-10b6739bf513/verbos_en_ingles_pronunciacion_y_traduccion.pdf
    • https://uploads.strikinglycdn.com/files/a6e8bc3f-73e7-49d6-af35-68b5450e855d/vojudepu.pdf
    • https://uploads.strikinglycdn.com/files/3f0c393c-5e7c-4f45-83fa-f183f641d31c/nogixo.pdf
    • https://uploads.strikinglycdn.com/files/2c024e50-5673-4e51-96b2-5ca6ca4f47b1/20679589297.pdf
    • https://uploads.strikinglycdn.com/files/a91d170c-5171-4fba-95bc-e28b3a2c52c4/tunuramutajujurev.pdf
    • https://uploads.strikinglycdn.com/files/42e65da3-e084-4d62-959b-e765ed18a832/what_is_normative_ethics_definition.pdf
    • https://uploads.strikinglycdn.com/files/ce0d1ef1-ac04-43fe-bc58-eaf21a443e25/air_force_1_white_mens_11.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010cdc.bin
066a1502a2a9836aa01d242ec354a5930a52c635b1975c8180310c6679e547cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDC 5456 bytes
font_01_sfnt_off00011f44.bin
525c5c30f85beec6386c52d1efb0e8747218939d49e7a399e094b4e0834fcae6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F44 10576 bytes

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