Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f894272854162dc…

MALICIOUS

PDF

81.2 KB Created: 2021-05-11 06:11:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 51ce01f0fc97646f1fa8a525affce9e2 SHA-1: 0a510f14db94c9e56ca93b8d8b23976c2956ae58 SHA-256: 9f894272854162dc59ca6a469dbd740184629c4fd2c0bf6f5b1ab0229e40ccf8
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The document body, though partially corrupted, contains a search query related to gaming hardware, which is likely a lure to disguise the malicious intent of redirecting users to potentially harmful URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xajibur.ru/strik?utm_term=best+ps4+gold+headset+settings+for+fortnite PDF link annotation
    • https://cdn.sqhk.co/kajutizikodu/cml2f1V/26171203209.pdfIn PDF document text
    • http://garderob-podolsk.ru/ms_excel_formulas_list_with_examples_free_download_in_urducwvob.pdfIn PDF document text
    • https://foderojev.weebly.com/uploads/1/3/4/0/134041652/vumaganozimuxirufa.pdfIn PDF document text
    • https://nibowivuxewanu.weebly.com/uploads/1/3/1/3/131379040/susuferopu.pdfIn PDF document text
    • https://lazezareb.weebly.com/uploads/1/3/4/3/134311903/7e86d0647d.pdfIn PDF document text
    • https://cdn.sqhk.co/mepapogivoma/d7LUSoX/koveguxowiviludesepuxos.pdfIn PDF document text
    • https://wanesutilujat.weebly.com/uploads/1/3/4/8/134868149/509867.pdfIn PDF document text
    • https://mixofugu.weebly.com/uploads/1/3/4/3/134351041/lizile.pdfIn PDF document text
    • https://puduwuxibipufu.weebly.com/uploads/1/3/5/9/135966859/zedolonulusok.pdfIn PDF document text
    • https://simejozegedofu.weebly.com/uploads/1/3/4/3/134359486/9551944.pdfIn PDF document text
    • http://rastet-malysh.ru/zipasativikefoxovufavaaj0np.pdfIn PDF document text
    • https://lorotorerusut.weebly.com/uploads/1/3/1/4/131452969/1691846.pdfIn PDF document text
    • https://cdn.sqhk.co/zaviresodew/gjmhhdL/cisco_asa_object-_group-_security.pdfIn PDF document text
    • https://cdn.sqhk.co/tefulobesa/jjenJic/necromancer_story_hack_gems.pdfIn PDF document text
    • http://chambrehub.xyz/zajetuwudivatotefakiburfx74.pdfIn PDF document text
    • https://ladofozaser.weebly.com/uploads/1/3/4/3/134334290/gutudabafor_puwidevajovela_megabifiti_tivuvotiwenabo.pdfIn PDF document text
    • https://cdn.sqhk.co/niririga/UYgcd5j/tuvujesoxenazan.pdfIn PDF document text
    • http://fruitnaturs.space/30616919209couab.pdfIn PDF document text
    • https://narosixepitifon.weebly.com/uploads/1/3/5/9/135960882/penubimewawezut.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c30b87d5-e38e-4f4c-8f61-e356d9eaafe8.filesusr.com/ugd/347120_d86fb4ea17f741d2aeff06d0dd54f15f.pdf?index=trueIn PDF document text
    • https://7a1f2a0d-094a-4466-88af-72a4af93b9fa.filesusr.com/ugd/22739b_76bc8ac2a3ac4586907c2b76ff42561e.pdf?index=trueIn 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_off0000eada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADA 5440 bytes
SHA-256: 430729ef8139e250b6411c444ac5c2f14914c257d20834fbd35084c23cd7cd78
font_01_sfnt_off0000fd63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD63 10860 bytes
SHA-256: feac94a20f9db3e2fa7ccd1e1ce3523bb5c8940c981c76c3395107faf8870dca
font_02_sfnt_off0001224c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1224C 16060 bytes
SHA-256: 2173a1880e9f774f759393e7d0d28dda91d04d8a3eae6bea41b822770b343b90