Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7684ffc84f3dabd…

MALICIOUS

PDF

77.0 KB Created: 2021-03-15 16:19:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: ab93585a276f82f2196e10cc717f333d SHA-1: d9429cdeca598d94f11eda0eef7c5ba3d760481f SHA-256: b7684ffc84f3dabd47fdc4cbefeb3c10b9a04ea3b0406d04bcbf3b11f478eeea
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as part of an SEO link farm. The embedded URLs, such as 'https://leonvi.ru/wix?keyword=georgia+blue+card+renewal', suggest an attempt to drive traffic to potentially malicious or spam-related websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://leonvi.ru/wix?keyword=georgia+blue+card+renewal PDF link annotation
    • https://cdn.sqhk.co/xezojutatow/iQJhjhf/bike_racing_2020_unlimited_money.pdfIn PDF document text
    • https://cdn.sqhk.co/sevigexew/gi5fjiz/boxcryptor_vs_cryptomator_ios.pdfIn PDF document text
    • https://torevoxun.weebly.com/uploads/1/3/2/7/132712334/jugiturorikapowarew.pdfIn PDF document text
    • https://cdn.sqhk.co/rizitewav/iGgfSzb/52317067291.pdfIn PDF document text
    • https://cdn.sqhk.co/bafiweba/gihjdgi/make_a_fake_wedding_cake.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451225/normal_600280535e6c6.pdfIn PDF document text
    • https://kuzogirig.weebly.com/uploads/1/3/4/7/134748708/tububa.pdfIn PDF document text
    • https://xasatodifugo.weebly.com/uploads/1/3/4/4/134439571/nuguwew.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380707/normal_5fc69f2cbcaf8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475586/normal_5fe2248e87310.pdfIn PDF document text
    • https://cdn.sqhk.co/rotonoba/Q4p2Wid/ritekolag.pdfIn PDF document text
    • https://cdn.sqhk.co/bibilofefi/zUKheQz/41401603714.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/686666b8-a850-4674-81b3-cf72dcf68131/duwelapokasomoruv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/575edb60-f8ba-4296-a2ca-25d9fe5254ec/gurukiwukebujimu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa29522b-2a52-495a-b011-9f55e7230b4c/88256680149.pdfIn PDF document text
    • https://s3.amazonaws.com/tugabijenovili/romeo_juliet_rekkai_virika_song_lyrics_in_tamil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a773d5f-d870-47b4-a6a9-12dc7056cf81/little_fires_everywhere_show_episodes.pdfIn PDF document text
    • https://s3.amazonaws.com/gonafoziguwewe/visual_studio_2013_ultimate_license_key_crack.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_off0000f10e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10E 5192 bytes
SHA-256: 3aa02d823c809c74706a698dd5043776a633b1d84f94f7589c82f52f4f26016f
font_01_sfnt_off000102d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D9 10532 bytes
SHA-256: 15eac3dae11f82fb7afa5d0dd27db74ad87b028f98f2e7273bc63b8707d16000

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