Malicious PDF — malware analysis report

Static analysis result for SHA-256 e399cf5e3ec27c5f…

MALICIOUS

PDF

78.2 KB Created: 2021-04-08 04:39:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 3afe454f9ae97eef91c79a84b02f98ed SHA-1: c75320c97c3a3c53a191900d420bc00eb0acdf9c SHA-256: e399cf5e3ec27c5fd60e6baec5d72d13174ffe7b3476cb568c3a37181a194538
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 0.9998

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://gimoguvi.ru/123?utm_term=export+costing+sheet PDF link annotation
    • https://cdn.sqhk.co/jubawiwa/nBicigg/shareit_pc_latest_version_2018.pdfIn PDF document text
    • http://xamawigokoke.mygamesonline.org/5010450342.pdfIn PDF document text
    • http://xuwuvewisin.mypressonline.com/how_to_get_employment_insurance_canada.pdfIn PDF document text
    • http://tiwilofojifig.sportsontheweb.net/88414700523.pdfIn PDF document text
    • http://lifolibi.sportsontheweb.net/vikipuxixegiloxajob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365591/normal_601093a1341a8.pdfIn PDF document text
    • https://cdn.sqhk.co/gopefovepagi/ie1iiLu/chess_online_app_not_working.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383800/normal_605303f77d44c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459921/normal_5fe3e37cd2895.pdfIn PDF document text
    • http://kogutojoveso.mywebcommunity.org/atwood_gc10a-4e_parts_list.pdfIn PDF document text
    • http://vofigasu.medianewsonline.com/a_briefer_history_of_time_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478655/normal_6068a5056cf1f.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/64538004-5d01-4aeb-a765-c08d52b6e081/2193717053.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdfdbe05-03d6-4b5a-83d1-cf353c43e0db/how_to_start_an_electrical_engineering_business_after_mechanical.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95a188ab-4b19-410c-bebd-b710bcf4ed78/what_is_the_meaning_of_the_first_stanza_of_the_poem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1b8794e-1c80-45c9-9dc8-4ea72649b152/singer_sew_mate_5400_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bddd403-36e6-442b-9d8a-7c9e009969ec/konas.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF542 4976 bytes
SHA-256: 5a45af1144bb2044d610b33d488e03a6d70cb11e598b7913b6289a46ae86dd72
font_01_sfnt_off00010639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10639 11180 bytes
SHA-256: a11410392283794b5fc1d9ee79c862f20fbc6d3d6824f8d1988269f2d1609308

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