Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d37e8172b52240b…

MALICIOUS

PDF

66.4 KB Created: 2021-04-04 05:33:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 107229d6281e5bca9b933361c6b4f904 SHA-1: 9a04be5e407fc1bc856d664089ac3246838193c5 SHA-256: 7d37e8172b52240b062d20b5dc818f5cbe0aa10726ab242c1915ab5540900e9a
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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-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://resalured.ru/strik?utm_term=brother+mfc-8480dn+drum+replacement PDF link annotation
    • https://cdn.sqhk.co/lipisedopila/WheLGPo/half_flannel_half_cotton_sheets_queen.pdfIn PDF document text
    • https://cdn.sqhk.co/vuxijavapul/ghjjejd/4721541840.pdfIn PDF document text
    • https://cdn.sqhk.co/wafavalufa/hUMb1i2/betway_app_kenya.pdfIn PDF document text
    • http://semabemebutew.22web.org/what_type_of_plate_boundary_does_subduction_occur.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad3cc8cc-c2f2-4997-9aab-b65ff18eb814/gugazeribigazixerite.pdfIn PDF document text
    • https://170a7d3c-74f0-42f5-9ead-98ae292a4922.filesusr.com/ugd/a18aa6_ec76f80aa6ef4562adf95408f6ccb4b6.pdf?index=trueIn PDF document text
    • https://836291d8-7b77-40db-be8c-3105928c7ef3.filesusr.com/ugd/aae074_d35890525f4041e9b9c0cc0bcca55081.pdf?index=trueIn PDF document text
    • http://wategasinoname.rf.gd/epson_xp-820_printer_problems.pdfIn PDF document text
    • http://mafakizukizunof.epizy.com/10583944075.pdfIn PDF document text
    • https://bdc3fad0-85dd-4e34-85f7-620d54d4ff6f.filesusr.com/ugd/10cedf_095144fac7a04a5186e4acc9894e90ea.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0d9ce9e-6318-4955-914a-c6e14c0e689c/garmin_430_install_kit.pdfIn PDF document text
    • https://377d1c6c-8747-407e-9a0d-bb8234813250.filesusr.com/ugd/f0b1fd_5aac0f38c08145d1a75a4f1969c8fe40.pdf?index=trueIn PDF document text
    • https://ab60d57a-1f92-408f-9079-0b325776b613.filesusr.com/ugd/724fb5_a9ac73f3196340e3b4f5e46c1e7ede6b.pdf?index=trueIn PDF document text
    • http://musizaxodolof.epizy.com/13706338989.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b4adae0-6fff-4969-865f-6f10d5895e0c/ramonuxifuxuduxozifi.pdfIn PDF document text
    • https://4f0754e2-f0c4-47db-826b-83042027646c.filesusr.com/ugd/7a11b0_3baff830eb384a4bbf320dd430ece853.pdf?index=trueIn PDF document text
    • https://527ed197-5826-4432-9c89-449afa9d705e.filesusr.com/ugd/65ef70_44528af6037d450f82755d7124c58d20.pdf?index=trueIn PDF document text
    • https://c6111751-42b6-464f-a8b1-832d492ff999.filesusr.com/ugd/3d0627_5b2e212052f3422f91437599e6aef263.pdf?index=trueIn PDF document text
    • http://dejedizanabi.epizy.com/benatubojarivumotuw.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_off0000c4d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4D0 5720 bytes
SHA-256: 33f3977abd7fa343228314a30549e5e377a2ae452e91c9deb0096364d237a5a6
font_01_sfnt_off0000d82a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82A 10672 bytes
SHA-256: fb391a96e2f2f0c440e9ef090c35a104245299b5a41b7b9fe571abba40973dd9

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