Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f33dbfaef419059…

MALICIOUS

PDF

79.6 KB Created: 2021-03-16 03:03:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 174c2219930463a7c6f774bba63561c8 SHA-1: 044bb2f180070be3b4e66ae3cb874b42c1d23dde SHA-256: 5f33dbfaef4190593d49e1b4a6f808cd9630ebeb215284b20499d0b6c250ab08
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous external URLs, with a primary suspicious URL being 'https://fokemale.ru/123?utm_term=autodesk+inventor+sheet+metal+flat+pattern', suggesting a phishing or malware distribution attempt. The document body is heavily obfuscated and unreadable, but the presence of embedded URLs and the link farm heuristic indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fokemale.ru/123?utm_term=autodesk+inventor+sheet+metal+flat+pattern PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4460461/normal_60052ddf229c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467306/normal_603827d112d31.pdfIn PDF document text
    • http://xemizawufogutuf.scienceontheweb.net/jemasorebuzawavobazu.pdfIn PDF document text
    • http://balegetiwep.mywebcommunity.org/pekisararazodakoza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463306/normal_60464ff519c7a.pdfIn PDF document text
    • http://wozilimesiz.mypressonline.com/zivobomipuzojegafu.pdfIn PDF document text
    • http://sazaleve.22web.org/zovenobe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418973/normal_60053a32b5eab.pdfIn PDF document text
    • http://wopudidadufi.22web.org/jobelifivob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367937/normal_6039f8867d54b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tiruweditivunaw.myartsonline.com/69907210053.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a7fb7be-ce1d-4c04-8cd3-8aac5bfcd7f4/91232207521.pdfIn PDF document text
    • http://buzumigasox.myartsonline.com/whirlpool_refrigerator_ice_maker_not_working_after_power_outage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a2a2d58-69da-4a97-b6da-ddbad3f92198/jutoj.pdfIn PDF document text
    • http://danijikuguwidak.rf.gd/nabopinukunid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d9f1dc1-6e62-45ab-bb62-8386a7bf6eb7/snow_white_wicked_queen_apple.pdfIn PDF document text
    • http://zesafemumibow.myartsonline.com/harry_potter_and_the_philosophers_stone_netflix_australia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2af6851f-e2f1-4856-b8d7-f82d0c017e7b/68940965174.pdfIn PDF document text
    • http://fiwabafedazuv.epizy.com/igloo_retro_mini_fridge_3.2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc11df14-f5c4-4cf4-905d-068674aaf243/gokekojapekejegot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bd7d87e-a973-4be5-ba73-7be1164b3fd0/fosilekevonasugeku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/200b3318-2ac4-409a-8c70-60a7422374bc/samsung_galaxy_note_4_battery_not_holding_charge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87235039-d6ae-45f9-8b7c-140078a3ee84/jexorukojibijexapowoboz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d967ac1-c665-4415-8c15-728b7b2abddc/disney_world_after_hours_june_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eabdd341-fb39-4e69-8150-8f0a132a1709/xusuwobasiteponinenel.pdfIn PDF document text
    • http://jalijoruki.atwebpages.com/sjcam_sj4000_air_4k_wifi_inceleme.pdfIn PDF document text
    • http://pulutugorivexek.atwebpages.com/allahabad_high_court_group_d_result_2020.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF786 5392 bytes
SHA-256: d0110ffc266ced83df87ce6451a465df9871826ccb176cea9e77d7c9cff9584b
font_01_sfnt_off000109bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BD 10840 bytes
SHA-256: 00fc2a31a1be4619cfa40502250d0e011a5fdedad4694c7872c8fb5eecef95a5