Malicious PDF — malware analysis report

Static analysis result for SHA-256 116386643d8c351d…

MALICIOUS

PDF

75.9 KB Created: 2021-03-15 01:16:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a25d135133416c75103c55ee25fe434f SHA-1: 3c686580a80c6487ed8414c59a6057f1b2faab12 SHA-256: 116386643d8c351d00c1c99c08edc6c8f2a7e877d63ada3c3f20b2aca3b978c8
156 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, characteristic of a link farm, with the primary suspicious URL being https://nipisod.ru/strik?utm_term=i+robot+cast+list. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/strik?utm_term=i+robot+cast+list
    • https://zesudegefomoga.weebly.com/uploads/1/3/1/0/131070027/d8d4b130539d79b.pdf
    • http://coloradocustomelectric.com/ginigofulhsu7c.pdf
    • http://getcreditcheck.info/kenmore_quiet_comfort_humidifier_partstkgea.pdf
    • https://disebaxixifos.weebly.com/uploads/1/3/4/7/134714932/ece4ac.pdf
    • http://astropsychology.site/dilated_pupils_drugsi1bx2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ad843f61-c544-48d7-8cfb-3c048b9edb46.filesusr.com/ugd/0dd9ed_9d899aaebbc64a82a38eadb58fedb4e8.pdf?index=true
    • https://98cdd5c5-c43e-49eb-9373-39517e896cbb.filesusr.com/ugd/90661f_79979a2507fe4c3ba36183f03211bd7f.pdf?index=true
    • https://bad3f395-1638-4667-b349-d6f934eeab49.filesusr.com/ugd/ed2d23_b9f53ee712294742b4ee105f8fe3b26f.pdf?index=true
    • https://93bb5028-8b17-4c47-8ab9-f46a024b0e86.filesusr.com/ugd/041612_bb02a92073c44a88b8a45158e21eea45.pdf?index=true
    • https://s3.amazonaws.com/vavebufevodutob/simojoralokevirug.pdf
    • https://s3.amazonaws.com/tixedujegibex/62056064378.pdf
    • https://s3.amazonaws.com/sukobogixe/3500266507.pdf
    • https://s3.amazonaws.com/widuxade/ethiopian_reporter_english_version_vacancy.pdf
    • https://s3.amazonaws.com/gonafoziguwewe/proform_tour_de_france_pro_5.0_indoor_cycle_reviews.pdf
    • https://11f44e1d-c86f-4be6-baa1-90970e7c24f5.filesusr.com/ugd/a298ce_2efe6839b19c4fcaaf0adf6981bfcb9b.pdf?index=true
    • https://0ef2f354-78a3-4528-990c-72f69c86fc6a.filesusr.com/ugd/6a0da6_be7c06e518304dbdaf828b2ac820fe77.pdf?index=true
    • https://s3.amazonaws.com/dinigugaxej/isn_t_it_romantic_sheet_music.pdf
    • https://67dbe094-6b68-4a2c-870f-9bd980043d88.filesusr.com/ugd/cff74a_f7bf1a6ebecc49268aac159dd2abb026.pdf?index=true
    • https://s3.amazonaws.com/fasomusogapovi/39556675929.pdf
    • https://s3.amazonaws.com/legenapi/mpsc_paper_2_answer_key_2019.pdf
    • https://ce322291-b3da-4cc2-ae0f-523e25daec44.filesusr.com/ugd/4530da_513dfbd0292a4785b29f0eb9c7829167.pdf?index=true
    • https://75e6d08a-b14f-4c2c-bd4e-3e6431d9d11c.filesusr.com/ugd/497a87_e0aa3f4995d045c9801acc52d8432818.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef57.bin
931f7d554d215644db2fc20c8c717b2ea60894ec71db5c4573b589908150cd7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF57 4872 bytes
font_01_sfnt_off0000ffee.bin
a272be89e663696193d27a399839c048929ab64b75426360d2088a7cf3dca5f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEE 10216 bytes

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