Malicious PDF — malware analysis report

Static analysis result for SHA-256 383845dab2ccd064…

MALICIOUS

PDF

88.4 KB Created: 2021-03-01 16:53:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 145a36522fe8b6abc69250b0b4ffd579 SHA-1: a68da2174f8f15cd7b1bf3c2786391961f7fecb7 SHA-256: 383845dab2ccd0646c70faf1b7714296573009e45ff99c840547a4138396687a
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document is part of a link farm, likely designed to redirect users to malicious sites. The embedded URLs, such as 'https://jottigo.ru/strik?utm_term=lifetime+54+basketball+hoop+reviews', further support this, pointing to external resources that could host phishing content or malware. No scripts were extracted, but the overall structure and URL findings point towards a phishing or content-luring attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://jottigo.ru/strik?utm_term=lifetime+54+basketball+hoop+reviews PDF link annotation
    • https://zumokijux.weebly.com/uploads/1/3/5/9/135966910/3610598.pdfIn PDF document text
    • https://cdn.sqhk.co/wodabakope/fiaeX66/zadofufipi.pdfIn PDF document text
    • https://cdn.sqhk.co/sifajoxojif/hhIhejf/6743233398.pdfIn PDF document text
    • https://xinuluparos.weebly.com/uploads/1/3/0/9/130969110/b08d841ce76818.pdfIn PDF document text
    • http://busivel.xyz/dutibukadudoruno9h3jq.pdfIn PDF document text
    • https://cdn.sqhk.co/xubulozirod/gdjbieq/49205694599.pdfIn PDF document text
    • http://esagafow.fun/rice_burner_mod_apk_revdlswlb7.pdfIn PDF document text
    • http://serviceforyou.site/heroes_of_olympus_book_1_online235jc.pdfIn PDF document text
    • https://cdn.sqhk.co/segenoliz/gjh6iiL/34035019641.pdfIn PDF document text
    • https://xonajuximo.weebly.com/uploads/1/3/5/3/135311854/8031839.pdfIn PDF document text
    • https://xariwavunulopex.weebly.com/uploads/1/3/1/4/131406448/2579480.pdfIn PDF document text
    • https://lukazerud.weebly.com/uploads/1/3/4/3/134343231/bufaresab-vigovajame-fosod-nabubutujiluwi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/navoburarovada/63393776811.pdfIn PDF document text
    • https://s3.amazonaws.com/topipovikapari/93361287469.pdfIn PDF document text
    • https://s3.amazonaws.com/falufusu/definition_of_capital_market.pdfIn PDF document text
    • http://sisukedazigi.epizy.com/enteral_feeding_guidelines.pdfIn PDF document text
    • http://tunogamux.rf.gd/how_to_set_a_clock_with_hands.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/91698450269.pdfIn PDF document text
    • https://s3.amazonaws.com/juwofuxufijup/lodge_cast_iron_care_guide.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001139f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1139F 5652 bytes
SHA-256: dfd7a2b2f44cae7fa682311c129d41f8ad3c2f4e171a3023d8b5684b043884ca
font_01_sfnt_off000126c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C4 1932 bytes
SHA-256: c4a0a6091bffb4a9149ab22e855f1e59e8ef2572e2c61c01c3e503ee78cf41f4
font_02_sfnt_off00013009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13009 10444 bytes
SHA-256: 2c9b204aea40554a5e7c177ab9b300f6c69054acda97560d5d8c658e72cfc404

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