Malicious PDF — malware analysis report

Static analysis result for SHA-256 d10979d8d658bccd…

MALICIOUS

PDF

90.1 KB Created: 2021-05-17 18:58:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 3e26041d03e0ebf076634932ea3fb4f0 SHA-1: efcefc0c62513766e8b3bd72c955a5f68cee061f SHA-256: d10979d8d658bccdf6a358b432d61db3719ffe5048b154c4180ff766953abba3
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://zajinet.ru/strik?utm_term=is+holy+cow+offensive PDF link annotation
    • https://kuwevezutasozif.weebly.com/uploads/1/3/0/9/130969868/34cefc5b3827.pdfIn PDF document text
    • http://xomunuxeju.sportsontheweb.net/darren_hardy_audiobooks.pdfIn PDF document text
    • https://supavutoni.weebly.com/uploads/1/3/4/7/134713891/paloxelexexabexiv.pdfIn PDF document text
    • http://samafutanub.mypressonline.com/algorithms_for_interviews_download.pdfIn PDF document text
    • https://vivagijep.weebly.com/uploads/1/3/1/3/131383698/4ddc9019ee85.pdfIn PDF document text
    • https://nijikubu.weebly.com/uploads/1/3/5/3/135347783/819207.pdfIn PDF document text
    • https://fezadegijowazon.weebly.com/uploads/1/3/4/0/134096780/960523.pdfIn PDF document text
    • http://xumupizaxuto.scienceontheweb.net/is_clint_eastwoods_movie_the_mule_based_on_a_true_story.pdfIn PDF document text
    • https://figusemaf.weebly.com/uploads/1/3/2/6/132682639/vosonu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9a511a5-efc0-46f2-b1ad-d993267fc5e6/jawun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd1a04b7-e8a1-4992-972a-e571a7f4536a/44856264924.pdfIn PDF document text
    • http://bagugexasorip.myartsonline.com/48649336111.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/804441dc-445b-4de7-9ece-94bb980c25fd/86436975175.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/82362124696.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/553b8394-b951-45c8-b9a7-570a6ee8ba8d/rayovac_ps1_charger_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/didowugorokirug/55028306868.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/078595be-2f94-4227-9ce9-7202b5ddcfca/36066142103.pdfIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/jupepa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4679af11-86ef-4f7b-89de-e2ff050e18ed/84595474744.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd2e34d3-5a43-420a-8d2c-b9d2c29cc9e9/how_to_clean_filter_of_vicks_humidifier.pdfIn PDF document text
    • http://dapekafuxururo.myartsonline.com/how_to_reset_electrolux_perfect_steam_dryer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bc1ebc7-8645-439c-801c-56cac27a7274/dezutugolimi.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_off00010c36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C36 4856 bytes
SHA-256: 9706568b8942422bfcda5e6b297cb3d5c3a54ecb86b9a998059d989f98af8132
font_01_sfnt_off00011ce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE1 11376 bytes
SHA-256: 8874b3b8d5ccd334ef94d09d1d816bf644eed7b6f851aedc1025740e1f8b2ed0
font_02_sfnt_off000143d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143D6 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501