Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4836f8c99a140a9…

MALICIOUS

PDF

80.9 KB Created: 2021-04-05 01:45:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 6a7d44f5911d57cab7be106eff141709 SHA-1: 8d553a736ba305a709d6caf5c1b6e9c34fb3974c SHA-256: b4836f8c99a140a9afed34cee908d9ee32afdd39a94241bd4835abd88109dbb0
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to a PDF search query, directing users to potentially malicious external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://dugedepap.ru/award?keyword=en+que+consiste+el+feudalismo+pdf PDF link annotation
    • http://remoliwagofaju.mywebcommunity.org/nuladubibezonalu.pdfIn PDF document text
    • http://igcopyrightverify.com/volebutowawikupajeel5ve.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373987/normal_604b475d6a32d.pdfIn PDF document text
    • http://mifirejetevina.getenjoyment.net/rula_ergonomics.pdfIn PDF document text
    • http://ladunosim.sportsontheweb.net/17671299580.pdfIn PDF document text
    • http://mir23.xyz/sotozidisy3pn.pdfIn PDF document text
    • http://runepudojeb.iblogger.org/fevaxevokojaw.pdfIn PDF document text
    • http://tonerinkstore.com/18879106245crmhp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449769/normal_604a81cb92a8c.pdfIn PDF document text
    • http://kiwufaninini.22web.org/moschino_t_shirt_size_guide.pdfIn PDF document text
    • http://yoga-fitness.space/archery_store_salem_oregon77tjd.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4719741e-b016-4223-915c-0fc1607a0e38/doubledown_casino_slots_games_itunes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfab3488-bd7a-40d0-80e1-63aaa232ab3f/navy_training_aircraft_carrier.pdfIn PDF document text
    • http://bagugexasorip.myartsonline.com/tikemogejelawageg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5d712b9-f1d1-46bf-867c-34c25331c6dc/how_to_do_a_pre_lab.pdfIn PDF document text
    • http://farovosodiwes.atwebpages.com/47736141621.pdfIn PDF document text
    • http://lunijikujapike.epizy.com/mezedavevisop.pdfIn PDF document text
    • http://situwosase.myartsonline.com/how_to_set_garage_door_opener_in_bmw_328i.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f50ea271-3a15-48da-91b3-cc9d999f3f00/how_to_learn_rap_god_fast_verse.pdfIn PDF document text
    • http://mepitar.atwebpages.com/saeco_incanto_sirius_coffee_machine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33490fb6-db61-44b1-8842-1beca25da970/power_pressure_cooker_xl_home_canning_book.pdfIn PDF document text
    • http://bamonoxo.onlinewebshop.net/auditoria_informatica.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB3 1644 bytes
SHA-256: 870d609fd1e21f4302a2edcdc8a227b2e7f9d642d6cbf0ee6ec8273b0d39316b
font_01_sfnt_off0000f7fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FD 5288 bytes
SHA-256: 36532dc02fd5f03202a896d3a1138342dab86e108b0310e3d68c6d8cfc09a92c
font_02_sfnt_off000109f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F3 13712 bytes
SHA-256: 75204ad329573796b27c814d6c3c271f839edd548dfe08e7020ec8837b69526f

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