Malicious PDF — malware analysis report

Static analysis result for SHA-256 b808de70b11422d1…

MALICIOUS

PDF

69.0 KB Created: 2021-04-03 16:52:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f16fca15447cf99a79d66b56236fcb5c SHA-1: ecd42d3c122434dca859394196714211d4486f0d SHA-256: b808de70b11422d1af74c363973d12c33f4405e8e423a79ae703fd220f2bc00e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are associated with link farm heuristics, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a spearphishing attachment used to redirect users to malicious sites.

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 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://leonvi.ru/wix?keyword=timber+construction+manual+birkhauser PDF link annotation
    • http://ayazshabutdinov.club/examples_of_formative_assessments_in_special_educationufdnk.pdfIn PDF document text
    • http://usmileofficial.site/shark_navigator_dlx_filter_walmartheyxp.pdfIn PDF document text
    • http://vnatural.space/vikokuredikenivobed4x.pdfIn PDF document text
    • http://bas-vorota.ru/536764717795v2jv.pdfIn PDF document text
    • http://myimperfectmomlife.com/volefudasinulisolxurn.pdfIn PDF document text
    • http://idealica-ufficialeitalia.website/bach_fugue_g_minor_violin_sheet_musicyp410.pdfIn PDF document text
    • http://tcerkovniekupola.space/61663201006wlyfy.pdfIn PDF document text
    • http://jawixogu.mygamesonline.org/bus_118_trier.pdfIn PDF document text
    • http://gemofesane.medianewsonline.com/human_anatomy_in_tamil.pdfIn PDF document text
    • http://mon-compte-cmb.best/jitufepekizaxabcirye.pdfIn PDF document text
    • http://cheatyou.site/725810634568kwsb.pdfIn PDF document text
    • http://popularchoice.space/english_language_lesson_ideasnjerz.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/c57204ce-5b21-4257-b709-b3cfae4b17df/87604027921.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4892c98-9a5b-46e9-9943-c8750a790325/42814026168.pdfIn PDF document text
    • https://04fc2a56-3ca8-4b90-bfe8-b05f9e7ed3d8.filesusr.com/ugd/51e9d0_23cfe5baf4524f2585004282c64722c9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d815a43-e1dd-4a19-8e74-1b729dd583bc/what_type_of_oil_does_a_2010_dodge_grand_caravan_take.pdfIn PDF document text
    • https://bef89f6e-6323-4b84-ad9d-a44490bfcc4f.filesusr.com/ugd/96768c_a4d9d80b59a144d9a55beeb31dc3ce67.pdf?index=trueIn PDF document text
    • https://45f91bdd-2b68-4e60-ae2c-b14373ae5332.filesusr.com/ugd/0d089b_59b1f884a6774b618cf6147c881041e4.pdf?index=trueIn PDF document text
    • https://ee42ee57-4547-4a8c-8a66-6cccb7f6869d.filesusr.com/ugd/2a9ad2_d39824d59309497dafa4912fc0388497.pdf?index=trueIn PDF document text
    • https://a5a8f6e1-24ae-425c-880d-6f4079e3c376.filesusr.com/ugd/035627_b5b81079d6154be8bc138ef5957def16.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_off0000d31e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD31E 5192 bytes
SHA-256: 45ca0d53cbcd65929830bbdcc48e59002cd4c0326ef125a923f2fc3a1a6d0718
font_01_sfnt_off0000e497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE497 9948 bytes
SHA-256: f424c4849b44ef0f09433569cef2c4a00140051744dc0c4d9d226feea8500cd5

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