Malicious PDF — malware analysis report

Static analysis result for SHA-256 aafe0e286c37062a…

MALICIOUS

PDF

81.0 KB Created: 2021-03-15 00:37:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d52087cc3c96fefd60f670d6d635d82f SHA-1: 70019cc75b47c5ecbc2aefb6685b3c8fffee260b SHA-256: aafe0e286c37062ae5ab8e1d51bc9d7b11aa0e6a93a990e78904190d0d1f3f6b
126 Risk Score

Malware Insights

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

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, forming a link farm, with one prominent URL pointing to 'nipisod.ru' which is associated with the lure of chainsaw repair manuals. The document's structure and embedded links suggest an attempt to direct users to malicious or phishing content, likely through a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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 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://nipisod.ru/wix?keyword=chainsaw+repair+manuals+online
    • https://cdn.sqhk.co/depadukat/i8Mk2tl/wikipedia_islamic_golden_age.pdf
    • https://cdn-cms.f-static.net/uploads/4469634/normal_6032b6d575897.pdf
    • https://cdn.sqhk.co/zedujunuwuxe/dthejjK/binary_logistic_regression_interpretation_of_results.pdf
    • https://static.s123-cdn-static.com/uploads/4425255/normal_6003ac9412f74.pdf
    • https://cdn-cms.f-static.net/uploads/4424400/normal_604aab9330469.pdf
    • https://cdn.sqhk.co/xanuramalu/4tJ8iyC/31141778186.pdf
    • http://buyervannakupitvsem.xyz/sawijan74hhj.pdf
    • http://apelsins.space/sukewosopifuxosorivwfrs.pdf
    • https://cdn.sqhk.co/xewasejeve/707ijLz/burger_king_breakfast_menu_near_me.pdf
    • http://devicesprotectionforusers.site/how_do_you_know_when_your_waffle_maker_is_readyf7ka7.pdf
    • https://cdn-cms.f-static.net/uploads/4454965/normal_60474d030ed73.pdf
    • http://help-copyrightservice.xyz/bsc_csit_application_formjmoul.pdf
    • http://insurancesouk.com/risuvanowupugijcgx.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://c7bff75e-0a19-4817-9d47-fca4cf08161b.filesusr.com/ugd/3b6424_83e4f61ee60d4c4a9f96ac8aae7c26d3.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9cb3385f-2653-4eae-b138-0c31d0af0839/50013785232.pdf
    • https://s3.amazonaws.com/dufekifaral/juzadazopiviwasaw.pdf
    • https://69c5641f-197a-42c1-bef1-daa502c1f1d7.filesusr.com/ugd/948cea_b17ab50892fa46168bdaeb3b89a464b4.pdf?index=true
    • https://4e4301d6-cc9a-4939-960a-6b497c1efea6.filesusr.com/ugd/d78803_175dee9c557b4cd5aa4d79d1a35dad2f.pdf?index=true
    • https://s3.amazonaws.com/libosokune/zowuzenubevujexupon.pdf
    • https://uploads.strikinglycdn.com/files/8af5a3fa-90ca-4e81-bbe5-4d506c1153f1/what_is_a_gy6_moped.pdf
    • https://711a90e7-97f2-4eab-8690-3003ec1e9b64.filesusr.com/ugd/a0905b_fac7d7b780254aa089ccd8400d2eee55.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ea2c79ab-19f8-4814-bd80-17d779de4194/arctic_king_portable_air_conditioner_filter_replacement.pdf
    • https://a6132035-7465-4fe4-be4e-2faa96c22dab.filesusr.com/ugd/cf950b_681b985b73b94f57ac155451ccda4f09.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_off0000f159.bin
d67463d01cd146bacc346c2383294db605366c8967e9bf5c94507036d7112874		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF159 4976 bytes
font_01_sfnt_off00010216.bin
349d43d0869b328d58431e7dc6906372b7e7ed0e85ee2ba34833598c6090c9c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10216 11112 bytes
font_02_sfnt_off0001281d.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1281D 4324 bytes

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