Malicious PDF — malware analysis report

Static analysis result for SHA-256 d71d5703cb0252b2…

MALICIOUS

PDF

142.7 KB Created: 2021-05-10 23:24:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 51f3e71cf8dc431fcd4c87fecbb18ff2 SHA-1: 740852ea9ea5fead240854715f79f3c1871747ef SHA-256: d71d5703cb0252b21dc67bc4e043c84210d584977e720e3c345b84ec6cd1502e
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with a primary focus on `https://soxebez.ru/strik?utm_term=blink+malcolm+gladwell+pdf+t%25C3%25BCrk%25C3%25A7e` and `http://wozekozexufoxol.scienceontheweb.net/voxuzexubiliwod.pdf`. The heuristic `PDF_SEO_DISPOSABLE_LINK_FARM` indicates the document is designed as a link farm on disposable hosting, reinforcing the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://soxebez.ru/strik?utm_term=blink+malcolm+gladwell+pdf+t%25C3%25BCrk%25C3%25A7e PDF link annotation
    • http://wozekozexufoxol.scienceontheweb.net/voxuzexubiliwod.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494677/normal_5ff9d98e787a5.pdfIn PDF document text
    • http://lnstagramcopyrightcenter.com/2006_bmw_330xi_transmission_problemsvcien.pdfIn PDF document text
    • http://zujewubowufonug.scienceontheweb.net/predictable_revenue_aaron_ross_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402297/normal_6010f4a7e6f32.pdfIn PDF document text
    • http://pagebake.com/kuvowujopl8de2.pdfIn PDF document text
    • http://price-list.moscow/vampire_diaries_season_8_episode_16_elena_looks_different05ch0.pdfIn PDF document text
    • http://pelistens.xyz/what_are_machine_learning_modelsohnlg.pdfIn PDF document text
    • http://espacecmb.xyz/paporusibevojatilar9cb5.pdfIn PDF document text
    • http://puvinizozibejir.mygamesonline.org/greek_alphabet_free_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b20aee1f-b1b7-4e4e-be5e-d884e4ece670.filesusr.com/ugd/10e3af_e31f10ac34e6470ea4e38bf932a53d14.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sabobenuwe/gin_rummy_card_game.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a998bae3-6a88-495e-857c-f0f86181d3a7/acer_aspire_e5-571p-55tl_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b641712-0535-4e4f-bfc4-b124052f15a3/ravunesibovifuji.pdfIn PDF document text
    • https://s3.amazonaws.com/wusigipufuvowix/ditevenesovesoziwuvenod.pdfIn PDF document text
    • https://b6f97e74-198a-461d-a312-d71b9712332b.filesusr.com/ugd/a2d007_5ffe40c1830b466eab939f97942295e6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/metakibeme/98980584881.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51189066-8c1a-4c81-a9ee-c78be6a4b136/pejofizujedapet.pdfIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/69142707100.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a61093e1-8a40-4094-91b3-431011342e30/is_jack_reacher_never_go_back_on_netflix_uk.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001da8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DA8A 5804 bytes
SHA-256: bf60d3badc41a6309c448d12405d585952aea85e29e9be9808051fc4e9cd0465
font_01_sfnt_off0001edd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EDD5 12876 bytes
SHA-256: f96f4e4f362fdff47e8a1ff5eb1e2135296457f7a44a1bac790dac9676c4980e
font_02_sfnt_off0002157b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2157B 16204 bytes
SHA-256: c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449