Malicious PDF — malware analysis report

Static analysis result for SHA-256 e722aeb1426167df…

MALICIOUS

PDF

84.7 KB Created: 2021-04-15 22:18:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cef739c9a0c11127846ebf74f0a347d8 SHA-1: 12ed717c55e3f7bf02ab01e29bff0a2927f97967 SHA-256: e722aeb1426167df9aad017963f01c6f2d2babbad6bfe554e0f73f6aaad591c5
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URIs, with a primary one pointing to 'nipisod.ru', suggesting a lure to a malicious site. The document body, though heavily obfuscated, contains text related to 'poorest famous person', likely a social engineering tactic to entice clicks on the embedded malicious links.

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://nipisod.ru/strik?utm_term=who+is+the+poorest+famous+person
    • http://kerutugizuxig.mygamesonline.org/nopesok.pdf
    • http://naturapple.space/biafra_war_songuyogo.pdf
    • http://lexaxak.mywebcommunity.org/michael_lewis_lexical_approach.pdf
    • http://fruits-summer.fun/big_data_analysis_methodsi3ei5.pdf
    • http://zozamowewideno.mypressonline.com/81209849918.pdf
    • http://lamaded.mywebcommunity.org/math_puzzles_printable.pdf
    • http://miwuzobi.sportsontheweb.net/15554329253.pdf
    • http://biomanix.best/583951059858hph4.pdf
    • http://romeital.space/what_size_ac_unit_do_i_need_for_my_mobile_homerxgco.pdf
    • http://rubeatyshop.xyz/danevaxajom4k27.pdf
    • http://lumejaramelu.mygamesonline.org/55974775508.pdf
    • http://nijaxubazaziw.mypressonline.com/tipos_de_manuales_de_organizacion.pdf
    • http://modozadubop.mywebcommunity.org/adele_-_someone_like_you_lyrics__sub_espaol_official_video.pdf
    • http://ludirobus.getenjoyment.net/mamolupado.pdf
    • http://pazefezos.mywebcommunity.org/54304679599.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ed21222e-fee3-4fab-8b52-e2ddb7bb35ab.filesusr.com/ugd/e73fea_90d7dfbb91634d54854f757d2a8a6e96.pdf?index=true
    • http://fukuselumetu.myartsonline.com/biografa_de_mario_benedetti.pdf
    • http://zukomakiduw.myartsonline.com/basel_1_framework.pdf
    • http://ginowane.onlinewebshop.net/gijabasaxit.pdf
    • http://xowobovu.myartsonline.com/36563681766.pdf
    • https://770cee9b-59ea-4c2b-ae8d-aad83b0abb79.filesusr.com/ugd/8b25c7_3a0d4bbeb6ef4e0cb3034f49a5c13272.pdf?index=true
    • https://40e214c1-1950-44e8-a195-e2c6eeb23253.filesusr.com/ugd/a517f4_121b031a71194340a80db92ae7147a28.pdf?index=true
    • http://safedoguno.onlinewebshop.net/72895860989.pdf
    • 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_off00010a5b.bin
47691717b9571a5ce33ff329188a7f5fa84135e63ad3249e07db175b29a71985		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5B 5120 bytes
font_01_sfnt_off00011ba7.bin
195513747b6be2c17125d97624f6b5964244442af27829b402bb3a48a13938ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA7 12460 bytes

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