Malicious PDF — malware analysis report

Static analysis result for SHA-256 916777eb68874b77…

MALICIOUS

PDF

78.8 KB Created: 2021-04-17 05:25:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 8e3f897eb15680e072c29daa49c6b01b SHA-1: ce612593158cb3f4badc849a5981caa4e79ec843 SHA-256: 916777eb68874b77ae3d19438cad4102484c9720e01c352f65497454c2fec6cf
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. It contains a large number of external links, many hosted on disposable domains, suggesting it's part of an SEO spam or phishing campaign designed to redirect users to potentially harmful websites. The document body, though heavily obfuscated, contains keywords related to lawn mower parts, likely serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dugedepap.ru/strik?utm_term=simplicity+riding+lawn+mower+parts PDF link annotation
    • http://sazulido.medianewsonline.com/17095082672.pdfIn PDF document text
    • http://blubadgehelp.net/multicab_iloilo_saleyss2c.pdfIn PDF document text
    • http://xatojefewimer.iblogger.org/84550096039.pdfIn PDF document text
    • https://cdn.sqhk.co/nomuzali/jyhdMSu/38485146492.pdfIn PDF document text
    • http://smartbright.club/games_like_the_resistance_avalon68o7k.pdfIn PDF document text
    • https://cdn.sqhk.co/wifinalimow/mjciHgg/51143159655.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzufoxo/amibjhc/81147589300.pdfIn PDF document text
    • https://cdn.sqhk.co/pimidima/ih1srie/lajifexerozel.pdfIn PDF document text
    • http://sozefubuvigapi.iblogger.org/gurasuvezejusilaz.pdfIn PDF document text
    • http://warowusavi.mywebcommunity.org/how_to_do_interior_design_for_bedroom.pdfIn PDF document text
    • http://jelojutu.sportsontheweb.net/sezixiwulotipefalug.pdfIn PDF document text
    • http://vovality.club/dragons_crown_artbooksrzdx.pdfIn PDF document text
    • http://bovibuvebus.getenjoyment.net/vosunupidutogowubamikejo.pdfIn PDF document text
    • http://norikaloro.mywebcommunity.org/popasefojugejiwos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://012a8781-80b6-4d33-8f63-56d56ef93f15.filesusr.com/ugd/6d3794_7b068200662d4e6490b267607d7c619c.pdf?index=trueIn PDF document text
    • https://ff4d9611-e7ea-45f2-85d3-f0b464ef817f.filesusr.com/ugd/48f461_054c91c584554ca3bbef0843fa2cb55c.pdf?index=trueIn PDF document text
    • https://c3a7a64c-5591-430b-94d7-c2eadfdf3523.filesusr.com/ugd/966478_b1fd38acc9c64df78475ee4dd72cd044.pdf?index=trueIn PDF document text
    • https://1a73feee-b327-4bc5-ac54-9d367b44a425.filesusr.com/ugd/226baa_41af0d2bfdbb450cb542d4434ca04f5a.pdf?index=trueIn PDF document text
    • http://tusewareja.epizy.com/advanced_life_support_course_manual.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_off0000f5c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C1 5688 bytes
SHA-256: 8844bdcaf8aa9f35f2fdccdfd4c3b73c9beed38853f07bb82eea81064480ec5f
font_01_sfnt_off00010923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10923 10908 bytes
SHA-256: 2b2bdce1b612d8df667ec01b241a999bc56c825ed370a5aac3af596302a5b0df

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