Malicious PDF — malware analysis report

Static analysis result for SHA-256 54d5aba0deb7981e…

MALICIOUS

PDF

73.8 KB Created: 2021-03-14 23:54:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 21602a386406dccabc1ddac2217bf284 SHA-1: d8450c966c79b7e713ec6b7c60307b01dca721e8 SHA-256: 54d5aba0deb7981e35bb77c96a48b42c72655339f4c41f68f43cf8e050663a4d
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-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.
  • 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://kuzutuzo.ru/123?utm_term=children%2527+s+shoe+size+guide+age PDF link annotation
    • https://cdn.sqhk.co/titolegun/gIhdeid/home_photo_studio_online_editor.pdfIn PDF document text
    • https://cdn.sqhk.co/sazalevimit/iaieUgi/15132344418.pdfIn PDF document text
    • https://dumetokewip.weebly.com/uploads/1/3/4/3/134394823/7158945.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412606/normal_60472febc2641.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422890/normal_603048bab88f1.pdfIn PDF document text
    • https://cdn.sqhk.co/piwoputi/FgighZu/peixe_celacanto_forma_de_reproduo.pdfIn PDF document text
    • http://creditpm.com/suxiliworezejas7gs8x.pdfIn PDF document text
    • https://popupobapovuzus.weebly.com/uploads/1/3/4/0/134012290/kanorakunibafad.pdfIn PDF document text
    • https://cdn.sqhk.co/masamiwe/aDrgi2P/spaceflight_simulator_download_pc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380699/normal_604643079688f.pdfIn PDF document text
    • https://cdn.sqhk.co/xakurusuk/e2Vxc74/word_master_pro_4._8._2_apk_download.pdfIn PDF document text
    • http://idealica-ordina.site/34690819696gid63.pdfIn PDF document text
    • https://pasezoxe.weebly.com/uploads/1/3/5/3/135347718/a0fbf1b33b87.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403820/normal_6008b75a84c3f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485569/normal_5fff4a7c38382.pdfIn PDF document text
    • https://cdn.sqhk.co/pigajifaw/ewigdjg/saxekaveminerafafewawumar.pdfIn PDF document text
    • http://sobakin.space/polk_omni_sb1_plus_bluetooth_setuptyeoh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sobavetugobi.epizy.com/56797819299.pdfIn PDF document text
    • http://konegepapiped.rf.gd/how_to_write_research_proposal_medical.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_off0000e3a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A2 5076 bytes
SHA-256: 9ffc196e737188350053d73546391cd0474c9b5c1ea59b044d42a48d4321c309
font_01_sfnt_off0000f4de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DE 11008 bytes
SHA-256: e44cd60785798c71990a0e971c0b29804de46096b31a759cc256de377f20cd36

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