Malicious PDF — malware analysis report

Static analysis result for SHA-256 99a68ac9c83f5982…

MALICIOUS

PDF

72.3 KB Created: 2021-03-01 09:10:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0c2341d1e3ab9e335aa64c61d4819388 SHA-1: 3a547a0ac92595bc2e94290ef174f230342f85e3 SHA-256: 99a68ac9c83f598296733d10485f2315e2debf92865a3a74f665ab567d1f03ea
156 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 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 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.
  • 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://fokemale.ru/strik?utm_term=how+to+calculate+inspiratory+flow+rate PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379849/normal_601daf2987f19.pdfIn PDF document text
    • https://geliwesirodired.weebly.com/uploads/1/3/1/3/131382982/68697f563d111.pdfIn PDF document text
    • https://nufewaxitobazat.weebly.com/uploads/1/3/4/7/134748461/4062296.pdfIn PDF document text
    • http://blu-ital.space/alone_pics_for_dp83xt3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377905/normal_5ff7a1c8daf21.pdfIn PDF document text
    • https://jukamonasob.weebly.com/uploads/1/3/0/7/130740128/d37e332.pdfIn PDF document text
    • https://ninafaguri.weebly.com/uploads/1/3/4/5/134592808/2308502.pdfIn PDF document text
    • http://alluniversity.fun/odd_thomas_book_reviewv3fet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375344/normal_5fcdfc256ae15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410462/normal_60282c86b3377.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445320/normal_600b78bddca3a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470405/normal_5ffef616aa882.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/novifamigot/anaesthesia_tutorial_of_the_week.pdfIn PDF document text
    • https://s3.amazonaws.com/subopukomanaw/jokoxokijoturewolegewo.pdfIn PDF document text
    • https://s3.amazonaws.com/zagubip/nokitesudumemuwavu.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/why_wont_my_security_light_go_off.pdfIn PDF document text
    • https://s3.amazonaws.com/wanalovum/vlookup_different_sheet_excel.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_off0000df3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3C 5164 bytes
SHA-256: 1ea249eb667d735c2edeada44dce7c743e18c74ee96ddd962226618eaa8724d1
font_01_sfnt_off0000f0f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F7 10336 bytes
SHA-256: d8ae81fb46983c135024156bf5d941108b8bb2df34cbd04662a04c83572cff44

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