Malicious PDF — malware analysis report

Static analysis result for SHA-256 38c4626c552f7192…

MALICIOUS

PDF

78.0 KB Created: 2021-03-28 18:42:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 7105c64b1e7f254becac99d7db034884 SHA-1: b255c2dbf6109f9b1a385aa26dbb5c2b590c45fe SHA-256: 38c4626c552f7192ded788f4f469de5d36a336fbd7738c566be8b32c85787c3d
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 0.9996

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://bologen.ru/wix?keyword=chemistry+physical+and+chemical+changes+worksheet+answers PDF link annotation
    • http://liketsven.xyz/sepufopigq7zwc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480897/normal_6032d3d25c7e1.pdfIn PDF document text
    • https://gorokose.weebly.com/uploads/1/3/4/0/134042322/ketasovexove.pdfIn PDF document text
    • http://tebapewulodafe.getenjoyment.net/yeh_shen_chinese_cinderella_summary.pdfIn PDF document text
    • http://bexukavinawexov.mygamesonline.org/6355108438.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374009/normal_604d18aa94d76.pdfIn PDF document text
    • http://emirofficialzm.com/xoxufaliregakavib8l8h.pdfIn PDF document text
    • http://jetotujaj.iblogger.org/electrical_engineering_jobs_in_indiana.pdfIn PDF document text
    • http://tefukuk.iblogger.org/18406870221.pdfIn PDF document text
    • http://topmassage.net/60220587996529m1.pdfIn PDF document text
    • http://vatidenow.medianewsonline.com/gezozunexifiwisapudenizo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393763/normal_60259ec353f0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464302/normal_604d34d31d93e.pdfIn PDF document text
    • http://zefutuwukeras.getenjoyment.net/xitufemerojanofu.pdfIn PDF document text
    • https://bexenexitefixu.weebly.com/uploads/1/3/4/7/134725849/955781.pdfIn PDF document text
    • http://afracheat3.xyz/wabexosipemeluwobv1mt.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://giduzorim.epizy.com/captioned_performance_theatre_royal_plymouth.pdfIn PDF document text
    • http://bututifeb.epizy.com/zisupuvarunuzizavimiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdb6c605-bd83-476a-8764-52f876da6a71/xizamixiwewenububapi.pdfIn PDF document text
    • http://fidotetunuxezi.epizy.com/nukukewoposogowopugekupan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93437614-5ea0-46d6-bd48-27fc574a01cb/seth_net_worth_2019_kim_kardashian.pdfIn PDF document text
    • http://dapibudajemuk.atwebpages.com/the_z-score_associated_with_the_98_percent_confidence_interval_is.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_off0000f324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF324 5652 bytes
SHA-256: 1751ce9a6f08c66d30e64fc2832bcf6cc8c526820750afeb07a3d1b701423327
font_01_sfnt_off00010649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10649 10508 bytes
SHA-256: 33331cd62bba653549e11032761821d4ad8f3a22c2fdd79b40ac7d032e7e64fc

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