Malicious PDF — malware analysis report

Static analysis result for SHA-256 1131e1cb380dc4a6…

MALICIOUS

PDF

78.9 KB Created: 2021-04-03 14:56:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 37024183397b034a513b855eed934a6e SHA-1: d91ddbcb2f5da83dd62581a7a25155cb6b557714 SHA-256: 1131e1cb380dc4a6f6868c19a0637f000f962791d23df854212ce94985bf2345
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9996

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 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://maypoin.ru/wix?keyword=can+background+check+reveal+past+employers+uk PDF link annotation
    • http://newuwedeza.mypressonline.com/fmea_book.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489045/normal_6061f8aeb7590.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366367/normal_5fc63c8ab4b02.pdfIn PDF document text
    • https://cdn.sqhk.co/fikalibumi/jhdjegi/group_discussion_topics_with_answers_in_tamil.pdfIn PDF document text
    • http://nenolowafi.22web.org/hsc_biology_question_paper_2020_with_solution.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408343/normal_5fee92c3081f2.pdfIn PDF document text
    • http://dusibarupuguli.medianewsonline.com/82724790612.pdfIn PDF document text
    • http://noxaduva.mypressonline.com/marosapomadido.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487631/normal_602e0c9d5af4f.pdfIn PDF document text
    • https://cdn.sqhk.co/bikakigiben/j5fgihh/56699177144.pdfIn PDF document text
    • https://cdn.sqhk.co/moromasi/jaH57TG/27963050594.pdfIn PDF document text
    • https://cdn.sqhk.co/misumirotoj/ibmMcgh/6723632089.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450724/normal_6050fd57a250f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393763/normal_602a6d461ba97.pdfIn PDF document text
    • http://fuxanujibiz.mygamesonline.org/vudefesuwisamedufi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426957/normal_5fda0c6396bd0.pdfIn PDF document text
    • http://firavowinoza.iblogger.org/how_to_take_screenshot_in_mac_mini_using_windows_keyboard.pdfIn PDF document text
    • http://nupifijaw.getenjoyment.net/the_timeline_history_of_islamic_art_and_architecture.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7c9e9c40-2b96-4f88-8065-b5ff5e495659.filesusr.com/ugd/3bfcae_7951fed5345e4f34a8377fa4101d2c53.pdf?index=trueIn PDF document text
    • https://0eaabcdb-938a-45a6-85a3-1a7d796bbcdd.filesusr.com/ugd/8d6d25_e529746c96074c40a03418295fe240b0.pdf?index=trueIn PDF document text
    • https://4c72699b-aa2e-4dc8-8bd5-1a54e8f938a6.filesusr.com/ugd/f3cb45_d03b56856fc54e4d9c289d5d3f1fa9fc.pdf?index=trueIn PDF document text
    • https://de461234-8179-4892-b46d-67dc01ae00af.filesusr.com/ugd/69bbc5_63207309ecf2433f9905d69c03469a79.pdf?index=trueIn 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_off0000f47f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47F 5756 bytes
SHA-256: 29393d92a9ba9bea81dda3b67f046e45906a2331498dafb713aba4302e67aaf2
font_01_sfnt_off000107e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E8 10556 bytes
SHA-256: 0ea16ec8fa1bb090f178d67b311bfe7fdbb4d80320471994f2d9d59db630bc74

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