Malicious PDF — malware analysis report

Static analysis result for SHA-256 877cb638c2be1623…

MALICIOUS

PDF

65.8 KB Created: 2021-03-23 23:05:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: bb39cc5ae4bcac631b395835643c0a16 SHA-1: 572101f445784950502b5a72b7277b133b8c08b8 SHA-256: 877cb638c2be16230141bad144002bc95ed464ae7e5d84f3fdc1695ac3039391
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 0.9998

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://golowaki.ru/strik?utm_term=most+popular+video+games+for+11+year+olds PDF link annotation
    • http://miribut.mywebcommunity.org/balance_sheet_ratio_analysis.pdfIn PDF document text
    • http://fortuneo.best/mpandroidchart_pie_chart_examplelqohn.pdfIn PDF document text
    • http://clientbluebadge.com/xeruvanuletotukicyfw5.pdfIn PDF document text
    • https://zeteleginogegop.weebly.com/uploads/1/3/4/5/134526156/jijagamojav_pimelafon.pdfIn PDF document text
    • http://azorocheat1.xyz/3529514550f2qg8.pdfIn PDF document text
    • https://kuromazu.weebly.com/uploads/1/3/2/6/132695519/faxeda.pdfIn PDF document text
    • http://wonnaturila.space/free_online_internet_reversi_game8s0hw.pdfIn PDF document text
    • http://soldonlakewood.com/64367050826zyvby.pdfIn PDF document text
    • https://vexofemefenulo.weebly.com/uploads/1/3/4/5/134594555/04ac2d0d.pdfIn PDF document text
    • https://sudazevoj.weebly.com/uploads/1/3/1/4/131406082/jesurujobutufiwe.pdfIn PDF document text
    • http://exampl1214.com/zegupizodosoponeveduvazlntg1.pdfIn PDF document text
    • http://pifemukopisare.sportsontheweb.net/cadette_outdoor_journey.pdfIn PDF document text
    • https://fazijexin.weebly.com/uploads/1/3/2/7/132741066/samifekid.pdfIn PDF document text
    • http://eslife.pro/sakoxikipufafisiwyv9w.pdfIn PDF document text
    • http://keep-travel.com/23384900921oi02u.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://eef50eb5-c47c-47bf-9843-15c7823b5fde.filesusr.com/ugd/e54fc7_9784b9e667eb4fb7b76694636859bbf1.pdf?index=trueIn PDF document text
    • https://9de673a2-3b8e-40eb-bbf5-c0ad8e71a3da.filesusr.com/ugd/bd5c68_e7990eae36f14d95bcaf29799a8fcf06.pdf?index=trueIn PDF document text
    • https://7aff118d-26f6-4d76-9bc9-1838009e7274.filesusr.com/ugd/f80014_36ea5bc5d22a49f8be7aac8d16a603eb.pdf?index=trueIn PDF document text
    • http://vedixemalirugi.atwebpages.com/how_to_connect_my_canon_printer_to_my_computer.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_off0000c2d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2D4 5580 bytes
SHA-256: 08b439c4ec849358a9b312e1a1756748d06a4af79e7d5de91430bb9d93d5206e
font_01_sfnt_off0000d5e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E3 10704 bytes
SHA-256: 8ed8186fd7c9f5d8ccbcf0f7e3dae0d9b07b27b3d13435404a291ece69723ac1

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