Malicious PDF — malware analysis report

Static analysis result for SHA-256 409a645b27df0c60…

MALICIOUS

PDF

71.5 KB Created: 2021-01-11 11:30:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 531317052afd45f53007be6151a3f860 SHA-1: 94869fdc0fa0181a2c4566c39a51deab60be0b21 SHA-256: 409a645b27df0c60cc5454e26ee9fb2a2442473db6a1efa186408e46b5b323af
222 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure. The document contains numerous embedded links, many pointing to PDF files hosted on various platforms, suggesting a link farm or redirection scheme. The presence of a 'download' button lure further supports a malicious intent to trick users into clicking potentially harmful links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffking.ru/aws?utm_term=antivirus+android+terbaik+2019 In PDF document text
    • https://static.s123-cdn-static.com/uploads/4408853/normal_5fcac936d7691.pdfIn PDF document text
    • https://wufanamokedig.weebly.com/uploads/1/3/5/3/135326106/0a7600facf942.pdfIn PDF document text
    • https://xawavefite.weebly.com/uploads/1/3/4/6/134667803/2657677.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403938/normal_5fd26a56d5de0.pdfIn PDF document text
    • https://cdn.sqhk.co/mosugukasiba/3ooX40J/color_wheel_picker_name.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383565/normal_5f996ba0b44b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452851/normal_5fb7c53263141.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497368/normal_5fb4dda092498.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382772/normal_5fb8f0f45dbc6.pdfIn PDF document text
    • https://worubagazew.weebly.com/uploads/1/3/4/6/134639575/7441191.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416326/normal_5fe647c4f3585.pdfIn PDF document text
    • https://zogijemomisun.weebly.com/uploads/1/3/4/4/134488733/fce6455.pdfIn PDF document text
    • https://cdn.sqhk.co/zezoxomop/SRA1FFk/lucky_live-_live_video_streaming_apps.pdfIn PDF document text
    • https://cdn.sqhk.co/wotutovebo/zDrQhaB/68033795356.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC42 3968 bytes
SHA-256: c8c8a8cc3538831215c265c07c3721e79b32154c27967d0080ef00b87a0bd07b
font_01_sfnt_off0000da14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA14 5520 bytes
SHA-256: 07a02b740e5d893c54b5a74948f664d759e39784534acf510bd9db92306b6542
font_02_sfnt_off0000ecea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEA 10492 bytes
SHA-256: f86666c42adfa3942a9944d87b5c7d8ce099c0ffa43289b72c204d119585b3f4

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