Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0ff0bbf7803ece6…

MALICIOUS

PDF

89.5 KB Created: 2021-02-23 20:37:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f85ac4e530598d3d656ca1fe16a83228 SHA-1: bf388f0e7d77dc31b9b5792b6339c57a9bf61e48 SHA-256: f0ff0bbf7803ece6c86579fb8bfb264a71bca82279b694d80db4fc26ee867518
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a critical alert for linking to known malicious redirector infrastructure. The ML classifier also assigned a very high probability of maliciousness. The embedded URLs, such as https://crophysi.ru/wix?keyword=navegadores+web+y+redes+sociales, are likely used to redirect users to phishing or malware distribution sites. No scripts were extracted from this sample, but the primary attack vector appears to be the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wix?keyword=navegadores+web+y+redes+sociales In PDF document text
    • http://infokurs.design/44240254475rlbl6.pdfIn PDF document text
    • http://helplnstagram-confirm.com/what_foods_can_you_eat_on_an_anti_inflammatory_dietm714e.pdfIn PDF document text
    • http://flash-sar.online/shigleys_mechanical_engineering_design_9th_edition_solutions_manual_chapter_787gxd.pdfIn PDF document text
    • https://cdn.sqhk.co/gafisasiwu/gijgidE/guilty_pleasure_meaning_in_telugu.pdfIn PDF document text
    • http://hamsterbig.com/3808860029mwp21.pdfIn PDF document text
    • http://creamwalls.online/95879789346512hs.pdfIn PDF document text
    • https://rexawalifutox.weebly.com/uploads/1/3/4/4/134458468/2741557.pdfIn PDF document text
    • http://toleritikujomuj.22web.org/voligokutes.pdfIn PDF document text
    • https://cdn.sqhk.co/javufikari/JBhdghC/pinkfong_and_baby_shark_s_space_adventure_g.pdfIn PDF document text
    • http://natlegend.space/custom_navigation_bar_apk_mirrorbq40v.pdfIn PDF document text
    • https://cdn.sqhk.co/fabozesemi/j8Tjjqr/two_dots_game_music.pdfIn PDF document text
    • http://aazzzry.space/98844189575se980.pdfIn PDF document text
    • http://wildber.store/defending_jacob_episodes_season_2qzigx.pdfIn PDF document text
    • http://pet-guru.shop/63658184558z4rnm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gosefemifav.epizy.com/mimuzakanep.pdfIn PDF document text
    • http://demoxivefuwuvi.rf.gd/campbell_hausfeld_airless_paint_sprayer_parts.pdfIn PDF document text
    • http://xiwinuxad.rf.gd/2012_jeep_grand_cherokee_overland_v8_specs.pdfIn PDF document text
    • https://s3.amazonaws.com/petikamov/91988258681.pdfIn PDF document text
    • http://romipozaxijida.rf.gd/53545011817.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_off00010c73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C73 5468 bytes
SHA-256: 31246bac92f499f41d2dfefe5f4a72ecbeee86b03c8cb6a9e8430cc311d61bd1
font_01_sfnt_off00011f3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3B 10424 bytes
SHA-256: 69bbff458f4673dab3a7fae2605a5b45f72f92d1857e802f5bc7555fc6d75040
font_02_sfnt_off00014305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14305 16144 bytes
SHA-256: 18f56b7fae04e07bc119a468ad323bdda099da77b0772854d1c47cc1f39b9f3b

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