Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cedb8adb395ceea…

MALICIOUS

PDF

78.7 KB Created: 2021-04-03 05:41:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: f4fe6436b5521ec293b2dbc34513458c SHA-1: b5f82167f14e51b53253a713bb333fb17f8acab0 SHA-256: 8cedb8adb395ceea196188323baf0526b93f2f9d9ede10d172b43ebc1211c5f3
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to distribute malware or phishing content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution, as suggested by the 'Pdf.Phishing.Trojan' detection. The document body, though heavily obfuscated, contains keywords related to scholarship applications, indicating a social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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/award?keyword=motivation+letter+for+scholarship+example+pdf PDF link annotation
    • http://usechambre.xyz/activator_office_2016_professional_plusy26ip.pdfIn PDF document text
    • https://cdn.sqhk.co/gufezitaxato/igcO6ia/new_super_mario_bros_emulator_unblocked.pdfIn PDF document text
    • https://cdn.sqhk.co/labifikup/bjiJ1ic/pandemic_card_game_expansions.pdfIn PDF document text
    • http://mekujoviwe.mypressonline.com/the_lost_ways_book.pdfIn PDF document text
    • https://cdn.sqhk.co/kugefiruxat/iWMhdW5/ludo_king_hack_download.pdfIn PDF document text
    • https://cdn.sqhk.co/fekawitaxug/gdjdigw/rorupepepe.pdfIn PDF document text
    • https://cdn.sqhk.co/neridisen/eiatjhg/36677510484.pdfIn PDF document text
    • https://cdn.sqhk.co/nikapeke/jg7njd4/livestream_app_for_macbook_air.pdfIn PDF document text
    • https://cdn.sqhk.co/kixagixupo/d1hgicY/59056455279.pdfIn PDF document text
    • http://smcjd.com/10938192354kug7z.pdfIn PDF document text
    • http://lozejebivo.scienceontheweb.net/luxavevemobodipa.pdfIn PDF document text
    • http://mazikopipovix.mywebcommunity.org/25293045137.pdfIn PDF document text
    • http://my-credit.info/aerial_hoop_lyra_manualxjggh.pdfIn PDF document text
    • http://meetsalon.xyz/592649415879m5pw.pdfIn PDF document text
    • https://cdn.sqhk.co/porekige/dghjejh/rustik_fast_sling_puck_amazon.pdfIn PDF document text
    • https://cdn.sqhk.co/wijanotunam/Tgji2ie/meme_soundboard_2020_mod_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/juzinaramip/tesadapimujipi.pdfIn PDF document text
    • https://s3.amazonaws.com/jeduzizonox/best_course_for_financial_modelling.pdfIn PDF document text
    • http://xawiwevivuzox.onlinewebshop.net/67875773653.pdfIn PDF document text
    • https://s3.amazonaws.com/legesiliv/how_do_i_enable_qos_on_my_att_router.pdfIn PDF document text
    • https://s3.amazonaws.com/dobesogum/john_lewis_baby_sleeping_bag_guide.pdfIn PDF document text
    • http://bidejepeko.onlinewebshop.net/disizitar.pdfIn PDF document text
    • https://s3.amazonaws.com/mejifavo/zesufitukorajilura.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_off0000f556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF556 5528 bytes
SHA-256: e41af3b412af07a235cce94f3b60b1e68768ea0e2a3b32d73f7df7ea786fdd12
font_01_sfnt_off00010812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10812 10816 bytes
SHA-256: e94aae2ac5e16f475d949567d198abb33a4b16a1b4d1d083aa1639cc0754d316

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