Malicious PDF — malware analysis report

Static analysis result for SHA-256 edd4186eff5ab335…

MALICIOUS

PDF

74.1 KB Created: 2021-02-21 20:38:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 610985fac22c16c5a83cb4bfed9d8087 SHA-1: 92ff912afb398592ba9304b6c422cbb1a4dfc1ec SHA-256: edd4186eff5ab335b895c3057977c0d51324a89edf9a729fa426aeccca2b2335
126 Risk Score

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 0.9998

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://druttle.ru/wix?keyword=length+lab+answers PDF link annotation
    • https://cdn.sqhk.co/tavaxikanabu/giifghz/amtrak_routes_and_prices.pdfIn PDF document text
    • https://cdn.sqhk.co/wujozuzewed/ihjcgfB/baixar_auto_clicker_automatic_tap_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/foropogajag/gtX0QNG/frozen_ice_cream_maker.pdfIn PDF document text
    • http://kukushka.space/45459602647v920a.pdfIn PDF document text
    • https://cdn.sqhk.co/tinolaseja/0Mghdls/chat_virtual_colsanitas.pdfIn PDF document text
    • http://dkmz1.club/7026503725acl.pdfIn PDF document text
    • https://cdn.sqhk.co/sotatixorawi/eBmjdbz/69274794921.pdfIn PDF document text
    • https://cdn.sqhk.co/dokijesu/674Dhfm/your_texas_benefits_renewal_application_online.pdfIn PDF document text
    • https://cdn.sqhk.co/tunuviju/iihgibU/xodesilexewelipe.pdfIn PDF document text
    • http://thelandofbadideas.com/149776701584e70l.pdfIn PDF document text
    • http://m-laskin.ru/mofavirn5lsq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rovikejovejoto.rf.gd/zubuzomijewis.pdfIn PDF document text
    • http://rorujuzolu.epizy.com/pipuduw.pdfIn PDF document text
    • https://s3.amazonaws.com/resabomibogodaw/khokababu_bengali_song.pdfIn PDF document text
    • https://s3.amazonaws.com/xotomisen/givasopizatiluvopip.pdfIn PDF document text
    • https://s3.amazonaws.com/gonima/vba_code_to_combine_excel_sheets.pdfIn PDF document text
    • http://vixugow.epizy.com/dezirabonawoxere.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_off0000e641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE641 5120 bytes
SHA-256: b7f85eae478432e89adec731a7a0ba8c06dbf4918522896f00967451bafc40dc
font_01_sfnt_off0000f7ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BA 10492 bytes
SHA-256: 1b7c304ff798d019260f4a8e01ffc997386e0d91501ae63b1ea5b44ede2269a6

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