Malicious PDF — malware analysis report

Static analysis result for SHA-256 b98c657ffaca2117…

MALICIOUS

PDF

79.4 KB Created: 2021-04-30 11:17:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: e2b0f1fe08d3bc6d6996daf26e6cf66f SHA-1: 5fa3e6ba6e1b0f2ec4f13d859685196077e6dc33 SHA-256: b98c657ffaca2117ae94a605155748278a1690b9303afaf902def0a290819bad
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files, indicating a link farm or SEO abuse. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs are the primary indicators of compromise, directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/strik?utm_term=what+is+a+32+and+64+bit+computer PDF link annotation
    • http://xavesusefowale.mywebcommunity.org/55398166137.pdfIn PDF document text
    • https://cdn.sqhk.co/xejadukoxeta/ajhXje3/girly_playroom_ideas.pdfIn PDF document text
    • https://sefewazugep.weebly.com/uploads/1/3/5/2/135293251/xevawesuwimes.pdfIn PDF document text
    • http://nevinidonet.mywebcommunity.org/adobe_acrobat_pro_change_to_word.pdfIn PDF document text
    • https://cdn.sqhk.co/jofijoju/jhjbdib/rc_car_race_tracks_near_me.pdfIn PDF document text
    • https://pemiliruvobavex.weebly.com/uploads/1/3/0/7/130739389/zejubagosowap.pdfIn PDF document text
    • https://xoxudepibedewem.weebly.com/uploads/1/3/5/3/135317482/8587209.pdfIn PDF document text
    • https://cdn.sqhk.co/mubogasaven/jg0mtJq/xekagoxemoreteduwokuwevas.pdfIn PDF document text
    • http://wifunagidoli.mypressonline.com/what_order_do_i_read_the_star_wars_books_in.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5e652c44-c8a2-4170-8b63-1f74ea172bc2.filesusr.com/ugd/78c764_f2c0b0bf4f384620b9c8d998f0c71d61.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jiwotarotavuz/23397592037.pdfIn PDF document text
    • https://0f926834-650c-4d5a-b53c-ad60ae412ccc.filesusr.com/ugd/6a44d8_3408f249ff66452b833409494a34497c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fikuvine/chinese_pattern_vector.pdfIn PDF document text
    • https://438e95ed-c264-4db5-88d3-1a9ca8b91b86.filesusr.com/ugd/733c1f_76386f463ceb4f2480ffe12f66c532d3.pdf?index=trueIn PDF document text
    • http://mifojizu.myartsonline.com/ariens_lawn_mower_manual.pdfIn PDF document text
    • http://fixidil.atwebpages.com/general_biology_101.pdfIn PDF document text
    • https://s3.amazonaws.com/womirofop/bible_verse_tagalog_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/nilafafakem/how_many_a_certifications_are_there.pdfIn PDF document text
    • https://s3.amazonaws.com/nasitevu/lubukerawida.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_off0000f66d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66D 5972 bytes
SHA-256: fd689d08f202d23438907c817862f8333ca19eadf8e60ed533cd55b87230b510
font_01_sfnt_off00010a98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A98 11048 bytes
SHA-256: f70a3ee92ddfc5903c35e3bfa4298ba1add55b6f8a933d235c5ee66ae6587a67

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