Malicious PDF — malware analysis report

Static analysis result for SHA-256 b090212df326fdaa…

MALICIOUS

PDF

72.9 KB Created: 2021-04-06 14:13:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a7f878d4a03d7a65a82d04a83284f14a SHA-1: c7ef841656b0a04ed30c210e408a3e1e5239f857 SHA-256: b090212df326fdaa8d065a75aca5dc2d6a884ad8a27e87f3470ec14c9e19e85f
126 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are likely used to distribute further malicious content or phish for credentials. The document body appears to be obfuscated or corrupted, but the presence of external URIs and the link farm heuristic strongly suggest a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://ponafet.ru/award?keyword=boucher+prosthodontics+pdf+free+download PDF link annotation
    • http://bcpzonasegura10beta-viabcp.com/93712107453l5ws0.pdfIn PDF document text
    • http://begetus11ppz.xyz/katoen_natie_annual_reportcm631.pdfIn PDF document text
    • http://polafozu.iblogger.org/agriform_planting_tablets_sds.pdfIn PDF document text
    • http://ravigimojamel.mypressonline.com/78612394815.pdfIn PDF document text
    • http://begdas.space/rovedufomuxukepabaxusexyu907.pdfIn PDF document text
    • http://sokegex.mywebcommunity.org/femurojofupep.pdfIn PDF document text
    • http://pigemugugobur.mygamesonline.org/29885337991.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5548a280-a194-4776-8019-0e256783c1fa.filesusr.com/ugd/f2c1dc_018dae805682478d81fb11cc74c3b121.pdf?index=trueIn PDF document text
    • https://9eb5ee95-128e-4115-bcd6-d8db8525ce49.filesusr.com/ugd/9904c2_9d903f3d26574dfaa77c16bd4e110836.pdf?index=trueIn PDF document text
    • http://newitipalude.rf.gd/arabic_english_picture_dictionary.pdfIn PDF document text
    • http://fubiwewumuje.rf.gd/35722609558.pdfIn PDF document text
    • http://gavofime.atwebpages.com/anatomy_of_bones_and_joints.pdfIn PDF document text
    • https://91e55214-10ad-44cf-a10a-60a9392df58b.filesusr.com/ugd/e1c37d_db6da2f60b944fb294fbc07b58ab702d.pdf?index=trueIn PDF document text
    • https://61090d85-22e6-4724-b969-52a17785150c.filesusr.com/ugd/952c2e_89d1353849d94ed4a6cb466d80bd660c.pdf?index=trueIn PDF document text
    • http://sujunutab.atwebpages.com/tropical_smoothie_cafe_recipes.pdfIn PDF document text
    • https://s3.amazonaws.com/wolina/can_you_hook_up_a_universal_remote_to_roku.pdfIn PDF document text
    • https://s3.amazonaws.com/juduk/bsa_merit_badge_camping_worksheet.pdfIn PDF document text
    • http://barazaduxobuta.epizy.com/annihilation_vandermeer.pdfIn PDF document text
    • https://s3.amazonaws.com/toniseligiwuzux/20734931049.pdfIn PDF document text
    • https://s3.amazonaws.com/matogapibelifiv/what_is_the_setting_of_the_story_coraline.pdfIn PDF document text
    • https://d8ec88ce-93b1-4b83-b294-7016fd5b5063.filesusr.com/ugd/366252_3ddb1a787d6d4012bc0d5809180a5b32.pdf?index=trueIn PDF document text
    • http://suxuzodezojoni.epizy.com/who_is_the_strongest_roman_god.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_off0000c7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7ED 5384 bytes
SHA-256: ecb514f1448c18e8149efe33b4ff93aef2f87bfaf62119a46f20de20564e8961
font_01_sfnt_off0000da4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4B 10096 bytes
SHA-256: 4eda1205d33caec29ef92bb4b42a5950d7d12c49681a46948051bdaeae7dc8d3
font_02_sfnt_off0000fd0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0D 17040 bytes
SHA-256: 203786a90b7b19c181cbcec82bbd0cb850d77443659f5b50f1daa6be91f932f3