Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdcf57c992141051…

MALICIOUS

PDF

76.0 KB Created: 2021-03-16 12:52:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 346494fd8cb8e040ff626d3ba019cdcf SHA-1: 50782ae8a6d1c443301de82954ac8f5354f2db0c SHA-256: bdcf57c992141051e17e2fbc4ea327fd2ea30d31eb23589dc65e056f561cffdb
194 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. It uses an invoice-themed lure. 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 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://soxebez.ru/strik?utm_term=letter+of+creditable+coverage+unitedhealthcare PDF link annotation
    • http://remontvorot24.com/common_core_sheets_converting_place_value6owwg.pdfIn PDF document text
    • http://help-bluebadgecenter.com/92592646544ejve2.pdfIn PDF document text
    • http://zonitupupafof.sportsontheweb.net/kizonipimuxute.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463300/normal_60050eb29853a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477139/normal_5fc9e93330b7a.pdfIn PDF document text
    • http://likedizar.medianewsonline.com/encyclopedia_judaica_vol_14.pdfIn PDF document text
    • http://frankiearvelo.com/soap_cutting_asmr_clearoj34i.pdfIn PDF document text
    • http://meinekarten.best/32999805536g3j8c.pdfIn PDF document text
    • http://chunyoo.com/ic_7805_voltage_regulatorwaoyd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c3438639-6a75-4920-aa4f-d1e0b619354f.filesusr.com/ugd/3be3a7_a4e435d9b4aa47108d7e2eb2564079ff.pdf?index=trueIn PDF document text
    • https://0f424234-9c27-4462-a606-4b2ccecf17d8.filesusr.com/ugd/b42a09_a03fc18e4b404139b68d0c5eb3bd681f.pdf?index=trueIn PDF document text
    • https://8d6920c1-aef5-45ed-b1a0-e693d63948fb.filesusr.com/ugd/0a593f_eac639319d7b4f0fbeef34bebc1bcd33.pdf?index=trueIn PDF document text
    • https://6ddb26ad-aa8e-4a3e-a925-5cef6fc035e1.filesusr.com/ugd/d3d820_b8db169f5fae48b6b3ab044855dbe819.pdf?index=trueIn PDF document text
    • http://rivenoke.onlinewebshop.net/54742703056.pdfIn PDF document text
    • https://ae26bae5-b1f3-4fb2-a0ba-5d2f2d23988c.filesusr.com/ugd/aec2ea_c176fd326e204983adcfcea334732bc0.pdf?index=trueIn PDF document text
    • http://nukilaba.myartsonline.com/kufumopaxevot.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_off0000ecd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD8 5248 bytes
SHA-256: f7c50f1bd99cd9a59617881ef21912065e6bd6ccdd8399cbd686e5f585133db2
font_01_sfnt_off0000feb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB8 10424 bytes
SHA-256: f8e33937d1df7c394eefdfffdb69326868e8850635f5c4c038c268cc0821316b

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