Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c06b721b2635444…

MALICIOUS

PDF

81.2 KB Created: 2021-04-10 08:42:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 1216d6b314d79f3f799e0bfbf9070185 SHA-1: 0e30165d83d8fd62cbf6ac084aee24f83c2fd0c2 SHA-256: 5c06b721b2635444950ca9b150ef7cec50138aa5539f3c62516a55e448850b3b
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous external URIs, with a primary suspicious URL being https://botokaw.ru/strik. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests it is designed to redirect users to potentially harmful content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 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.
  • 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://botokaw.ru/strik?utm_term=elric+of+melnibone+book+1 PDF link annotation
    • http://poguferuliwu.iblogger.org/can_i_put_bath_salts_in_my_humidifier.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://af18ad75-7652-4b25-b9e0-8da5fded0af1.filesusr.com/ugd/529385_0e69c925d1054fd8b08507f5e38b834e.pdf?index=trueIn PDF document text
    • http://jizuvopanusin.rf.gd/jatoxusilisizebenubu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5f4bec4-0323-448d-ac7a-b14e217499e6/79448335098.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d25b607c-6170-4274-8aa6-efb5eedceedd/what_is_the_theme_of_the_great_debaters.pdfIn PDF document text
    • https://788ae96d-7a4f-4726-91a9-07bb742fb3e7.filesusr.com/ugd/97aff7_943eee7ebac543f88af2aa960d6a48c9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6352de0-a91b-4f62-ae09-255be70ebcdf/ritutozu.pdfIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/captain_underpants_book_11_full_color_release_date.pdfIn PDF document text
    • https://4b5f4e46-8b81-4257-bf39-61fc08ba57b0.filesusr.com/ugd/7ea8bb_781fd71fc5fa4ed88e0fc363aa21ad45.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wovitiku/interview_questions_format.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca759c36-d20c-4a15-adda-b9af5d8b1dc1/where_can_i_buy_paper_shredder_oil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b2a8b27-e248-4f48-82a7-5e2fe7da7edb/jusilorugejarakamuwep.pdfIn PDF document text
    • https://s3.amazonaws.com/jejulurowev/css_format_sublime_text_3.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/33870195138.pdfIn PDF document text
    • http://damusoborubumo.epizy.com/bmw_i3_technical_specifications.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5994dfd-6803-43fa-a6be-ddb9c87cc066/how_quickly_can_you_get_a_wedding_dress.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcc30107-b1b7-4e17-81b7-c74f03ea5665/lg_leon_4g_lte_battery.pdfIn PDF document text
    • https://9480ebe7-8096-4165-94d5-b35dd525e9f4.filesusr.com/ugd/07b43d_e79337d921844b6d8d2c2a78288e9a2d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/foneniz/27982868074.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f52b42d0-095c-4b7b-948b-8fae2e9a45ba/fomegod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5289b607-7b7e-479d-876c-570a4ee76492/how_do_i_steam_clean_my_ge_oven.pdfIn PDF document text
    • http://dexileju.rf.gd/maze_runner_death_cure_book_synopsis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/beaadad3-ab07-4f73-94ce-8970afa39173/how_to_use_dr_brown_bottle_warmer_milk_spa.pdfIn PDF document text
    • https://f7690f66-1871-4559-97e0-239dee5b15da.filesusr.com/ugd/d2cc1f_d0e2d3f4cf5c42dfa7280b85d1aa39cd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d0563ff-059a-4b1a-9244-04627ba80720/53504654850.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10044 4852 bytes
SHA-256: 39546d5ac8d5bad2fd278ddd585a36aa953740d2d7e4fe208685486aea456625
font_01_sfnt_off000110bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BC 10968 bytes
SHA-256: 10491a7384ac66f10566c46c229fc36bc500f66e559c760a88758c22215b5112

Open this report in the interactive analyzer, or submit your own file for analysis.