Malicious PDF — malware analysis report

Static analysis result for SHA-256 a75a1ab26bb0194d…

MALICIOUS

PDF

79.0 KB Created: 2021-03-18 07:55:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a5119aa0d7652479b176092db454143 SHA-1: d7f6d612485a88a58a7011eb13490bb398eae800 SHA-256: a75a1ab26bb0194d829d092a291724723d058f711a40c9224cc8e6604839611f
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains an embedded URI pointing to 'ponafet.ru', which is likely a malicious domain used to host a phishing page or download further malware. The document body, though heavily obfuscated, suggests a lure related to a 'Redox worksheet'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://ponafet.ru/wix?keyword=redox+worksheet+%25232
    • https://static.s123-cdn-static.com/uploads/4476142/normal_5fcb5455e2c1a.pdf
    • https://kumusexowefas.weebly.com/uploads/1/3/2/7/132741352/19a238a9ba.pdf
    • https://tipiwaterexiw.weebly.com/uploads/1/3/3/9/133997214/sitosilalutofo_tajojotofipu_bumorelofujof.pdf
    • https://pofekabebo.weebly.com/uploads/1/3/0/7/130739116/kibugakaf.pdf
    • https://cdn-cms.f-static.net/uploads/4375356/normal_6049851fd8187.pdf
    • https://cdn.sqhk.co/jotenitix/hifijVF/mewixilizeki.pdf
    • https://static.s123-cdn-static.com/uploads/4404520/normal_6004156b6be01.pdf
    • https://rikujenaxa.weebly.com/uploads/1/3/4/6/134667742/4763034.pdf
    • https://static.s123-cdn-static.com/uploads/4393925/normal_5ff7f90002512.pdf
    • https://cdn-cms.f-static.net/uploads/4419002/normal_5fd94cb4f19fd.pdf
    • https://cdn-cms.f-static.net/uploads/4488569/normal_602fc15ec758c.pdf
    • https://cdn.sqhk.co/kivipemo/igjogi7/nixotaxap.pdf
    • https://cdn.sqhk.co/xosaletozobi/pevPfEk/48752303495.pdf
    • https://mexubigewexuni.weebly.com/uploads/1/3/1/3/131384635/f172db556346.pdf
    • https://cdn.sqhk.co/someteku/bM1Dge1/gadgets_360_compare_tablets.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f266bc01-3db2-44ef-a2b9-333ff9fa81d1/deepak_chopra_21_day_meditation_challenge_2020.pdf
    • https://s3.amazonaws.com/zemunomipazikez/escape_room_games_free.pdf
    • https://uploads.strikinglycdn.com/files/6e71f27a-2bc1-45e2-8d66-7708e98a0e6d/how_do_i_change_the_location_on_my_midland_weather_radio.pdf
    • https://s3.amazonaws.com/gizonukorad/pulse_oximeter_sensor_datasheet.pdf
    • https://uploads.strikinglycdn.com/files/0c48a073-5ee9-493c-a91b-bc2dfaaada42/tipos_de_comunicacin_en_informtica.pdf
    • https://uploads.strikinglycdn.com/files/ed0bd62c-760b-4197-87f0-a15441b01e2e/manually_parse_json_c.pdf
    • https://s3.amazonaws.com/silubebebefuju/vusuxezafipetom.pdf
    • https://s3.amazonaws.com/vuforewebub/what_kind_of_battery_for_chamberlain_garage_door_opener.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_off0000f905.bin
9f364aa857692747859699dc9a79e6611380a29155e0a5ecb7ed2269262928b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF905 4900 bytes
font_01_sfnt_off000109c9.bin
e4292eba752b09029326c49368536028b21e286e44c4f9d0f8508a19fed569e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109C9 11224 bytes

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