Malicious PDF — malware analysis report

Static analysis result for SHA-256 35047b5052b1281b…

MALICIOUS

PDF

81.1 KB Created: 2021-03-27 11:08:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3e68cca5a96deb9ad51687a843f4c238 SHA-1: e1808de9605b90793978194ccd987d5a0ad41794 SHA-256: 35047b5052b1281b1b781aff36a57309959a893924ef399c8ad1155f452e2869
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or SEO link farm. It contains a large number of external links, with one prominent URL being https://nipisod.ru/123?utm_term=don%2527+t+starve+shipwrecked+food+guide. The document body is heavily obfuscated and appears to be corrupted, preventing a clear understanding of its intended lure beyond the presence of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/123?utm_term=don%2527+t+starve+shipwrecked+food+guide
    • https://cdn-cms.f-static.net/uploads/4426955/normal_601f22c5889f0.pdf
    • http://zebozewazogaso.scienceontheweb.net/xukobevigotokedi.pdf
    • https://cdn-cms.f-static.net/uploads/4496607/normal_605955132e565.pdf
    • https://cdn-cms.f-static.net/uploads/4413977/normal_605b1b6e05932.pdf
    • http://zitupow.medianewsonline.com/business_information_system_free_download.pdf
    • https://static.s123-cdn-static.com/uploads/4380079/normal_5ff4f646df5e8.pdf
    • https://static.s123-cdn-static.com/uploads/4501201/normal_5fc61236af646.pdf
    • http://xugaguf.mypressonline.com/wimazorafibal.pdf
    • https://static.s123-cdn-static.com/uploads/4447436/normal_6001f57525d18.pdf
    • http://leduxebawini.22web.org/livery_templates_bus_simulator_indonesia_terbaru.pdf
    • https://cdn-cms.f-static.net/uploads/4393348/normal_6028e88f6ac13.pdf
    • https://cdn-cms.f-static.net/uploads/4446789/normal_604fecc69b374.pdf
    • http://dogoderusokita.iblogger.org/gazanupaxu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d7e981a8-8c4a-445e-aef0-60d3d4911bd2.filesusr.com/ugd/65d69c_6a3db75634ad42bc8d71eb7bc4d32b1e.pdf?index=true
    • https://968bac2e-1409-45a7-bd11-2c37eba47390.filesusr.com/ugd/c81504_0e92ae735bd8410e828e8c9e74037ebf.pdf?index=true
    • http://ruzunol.rf.gd/8365498603.pdf
    • https://92fa68c6-d088-48c5-94d9-776fe0504fc0.filesusr.com/ugd/5a053b_6711cd2031f5438f9771a59747d714ea.pdf?index=true
    • http://pulupalu.epizy.com/72568260630.pdf
    • https://50bf384a-eeac-4f26-a262-e2ba1a5e00ba.filesusr.com/ugd/17159d_5cd715de7bc24d548db3e5ffea431685.pdf?index=true
    • http://tefuwileb.rf.gd/dafabokubenivu.pdf
    • http://towupew.epizy.com/vampire_diaries_season_1_episode_10_watch_online_free.pdf
    • http://lejugolidisixod.rf.gd/quran_surah_yasin_download.pdf
    • http://fijopad.rf.gd/bissell_pet_pro_revolution_not_spraying_water.pdf
    • https://64b67c6e-fbbd-4787-add8-9ed3e274c95c.filesusr.com/ugd/eb6612_2e97690f7a0942b4a335361f9a80f0d3.pdf?index=true
    • 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_off0000ffdf.bin
d94fb1e030464db1cf769f50f66e41f8035c62c3ece59933f56bc299a123c2e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDF 5632 bytes
font_01_sfnt_off0001132b.bin
192f527e65c453b66ea14aa4695243ffa5d7ce0da1c6d5f616a13bbcc97130b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1132B 10560 bytes

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