Malicious PDF — malware analysis report

Static analysis result for SHA-256 c389f3d1666c338a…

MALICIOUS

PDF

91.8 KB Created: 2021-03-29 22:43:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1f5a3d4dde35825490dcb455500a614 SHA-1: db9eb41453ff55b297cc10f44596b7ab4ab5e8f4 SHA-256: c389f3d1666c338a9aeec97e8872e5b01df6e4f40bd2474300e34aa1a0cd019c
156 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which are likely part of a link farm designed to manipulate search engine results. The primary malicious URL identified is https://xezojetit.ru/123?utm_term=neural+network+using+python+pdf, which is likely used to redirect users to malicious content. The presence of a PDF_SEO_LINK_FARM heuristic and ML_NYX_PDF_MALICIOUS classification strongly indicate a phishing or malicious content delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xezojetit.ru/123?utm_term=neural+network+using+python+pdf
    • https://kalogipewaga.weebly.com/uploads/1/3/4/5/134595512/siridalasugusaxekip.pdf
    • http://fewomazojuxed.iblogger.org/wuvatefid.pdf
    • https://cdn.sqhk.co/vesagivara/kidicih/aruba_303h_ap_datasheet.pdf
    • https://raxorevowipafe.weebly.com/uploads/1/3/4/7/134765671/3825373.pdf
    • https://cdn.sqhk.co/moxelutedoje/hidbOhC/methotrexate_mechanism_of_action.pdf
    • https://cdn.sqhk.co/felatadag/ihugisZ/koala_bears_chlamydia_one_direction.pdf
    • https://cdn.sqhk.co/pubamegumox/iggdgdO/tuxaxoxugegagujunuk.pdf
    • https://cdn.sqhk.co/jakufomego/ih6ifij/pukiwor.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://c30b87d5-e38e-4f4c-8f61-e356d9eaafe8.filesusr.com/ugd/347120_24919d57998d4c85b7e7348b9d528e72.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d5d0d8e4-f02d-4205-aa34-718fdf6440f7/victoria_secret_phone_number_1800.pdf
    • https://297de083-771a-4730-a3b8-a2afe8c7d209.filesusr.com/ugd/47424f_bed53247ebc54cecb3234f5eb03e37ba.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b37e6865-db66-4953-82d8-c74430c8e3f6/the_lorax_and_sustainable_development_answers.pdf
    • https://uploads.strikinglycdn.com/files/369f69a8-4181-4c74-9a91-8152abc25ec1/67805770283.pdf
    • http://rowodebifofida.rf.gd/altium_designer_viewer_summer_09.pdf
    • https://uploads.strikinglycdn.com/files/d039e0ff-12e7-451e-b61d-9e902a9c9dbb/katesukakivulafaku.pdf
    • https://ed59cdd8-0d75-4634-8bb2-7afdb9da103e.filesusr.com/ugd/9cb112_61ffbe7bf0df4aac8359debc9fbe5ecb.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b010c7ae-6a08-4938-a1e7-7861179770eb/highest_conduction_velocity_heart.pdf
    • https://uploads.strikinglycdn.com/files/14e8ff93-3881-46a6-93c3-1d4df40ec80e/kaferu.pdf
    • https://uploads.strikinglycdn.com/files/d0261d7b-c56c-4f5b-8530-ff916e0cea29/how_to_use_transfer_paper_for_vinyl_stickers.pdf
    • https://8a833fea-7c9a-4d2e-a5a7-d3590f42a3e5.filesusr.com/ugd/9aab09_6e59a63b93c2409286b57354c06a5389.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011b0d.bin
5980f7eddb66bd4745de969a72df1ffd04cf7b39f34cc61a2b19bfe3e1da57a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0D 5412 bytes
font_01_sfnt_off00012d92.bin
f309e3c98e047803bf966164d072878c73829f58b869588b97781036bd82b3a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D92 11040 bytes
font_02_sfnt_off00015373.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15373 4324 bytes

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