Malicious PDF — malware analysis report

Static analysis result for SHA-256 d810c6caf0618c91…

MALICIOUS

PDF

77.8 KB Created: 2021-04-21 15:53:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc08738d1be14334026899e332c9a0bc SHA-1: b33b124ed7b089ce005c4da8b366aaf60634c00b SHA-256: d810c6caf0618c9142597c5eb7afa1aadf339346f99c6cda2c7e6b3649338fe5
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection scheme. One of the primary external URIs, https://jumiwimov.ru/strik, is flagged as unknown reputation, and the ML classifier and ClamAV strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely to direct users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://jumiwimov.ru/strik?utm_term=why+does+peroxide+smell+bad
    • https://cdn.sqhk.co/ralapogifur/vhdhgge/artillery_3d_printer_genius.pdf
    • http://xafomona.mypressonline.com/54861425963.pdf
    • https://cdn.sqhk.co/rurizibaxami/LPiciRS/perfectly_pipeable_cream_cheese_frosting.pdf
    • https://cdn.sqhk.co/tabuguran/Jjfijjj/pavidumen.pdf
    • http://patamekuzon.iblogger.org/forij.pdf
    • https://cdn.sqhk.co/wibezudak/idWL7O1/vuwelesagurufutakaroko.pdf
    • https://cdn.sqhk.co/letareximo/GhdFijb/dash_mini_waffle_maker_chaffle_recipes.pdf
    • http://bumumapa.mypressonline.com/18048262442.pdf
    • https://cdn.sqhk.co/lojadisexudo/jeIxiaE/free_reading_comprehension_worksheets_halloween.pdf
    • https://cdn.sqhk.co/rapigufagi/bfnisya/bad_day_justin_bieber_lyrics_traduction.pdf
    • https://cdn.sqhk.co/wizevomorofe/ig4ieGt/kimaxonetofuduvo.pdf
    • http://modarab.mygamesonline.org/public_finance_management_act_zambia.pdf
    • https://cdn.sqhk.co/zapusukajev/Zjhgige/walking_zombie_shooter_zombie_shooting_games.pdf
    • https://cdn.sqhk.co/liminekaj/cFht3ic/mazemilitia_lan_online_multiplayer_shooting_game.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xupafokivudaked.rf.gd/acolia_definicion_medica.pdf
    • http://kogopixipinal.epizy.com/15489723714.pdf
    • https://70fbc5f3-53e4-4072-9ff7-a5862d19847b.filesusr.com/ugd/bb3bf9_96f39ff5937d4161a9b6107c939c7052.pdf?index=true
    • http://daboloxasorun.rf.gd/autosuggest_react_form.pdf
    • http://gidazajizi.rf.gd/smoothie_recipes_with_frozen_fruit_and_peanut_butter.pdf
    • https://s3.amazonaws.com/rejiner/switch_steal_unwrap_gift_exchange_free_printable.pdf
    • https://s3.amazonaws.com/wavunot/how_to_replace_armitron_watch_band.pdf
    • https://3a00e800-a8eb-44ae-aafc-ae9aecab8e06.filesusr.com/ugd/1715bf_637354ea45304c07a694d3452a2e07d1.pdf?index=true
    • https://71a5d838-4e22-4830-8da1-7955ec3365f5.filesusr.com/ugd/f2f43e_f58c700388394cf9ae2d81b32d097c27.pdf?index=true
    • https://83372c7a-1065-4b07-8284-b64562b46e84.filesusr.com/ugd/035489_5bbfd3588ad641e5a38205e9b62657f3.pdf?index=true
    • http://mixezized.myartsonline.com/kifozatuvufaza.pdf
    • https://e82ff0bd-cb1a-4782-8b92-0a0fb7657660.filesusr.com/ugd/d17951_b48afab1906b42d99b19acc70bd98592.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_off0000f075.bin
b2699726d911eda6a5e367f5f54dd554270aba15b6d737e756a77a6d9163fa54		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF075 5520 bytes
font_01_sfnt_off0001031d.bin
52ec81e5ef6216c09fc37df5d822d45bfeea3f49eccb9c2479255fdffbd1741a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1031D 10832 bytes

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