Malicious PDF — malware analysis report

Static analysis result for SHA-256 a48c0ce93d757ff0…

MALICIOUS

PDF

77.4 KB Created: 2020-11-24 22:34:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 3b5becf8896b552872d352d12f3107fa SHA-1: d8c418c3a9c31299ec0a146d550f9e957fe04dfd SHA-256: a48c0ce93d757ff086aa0b0554aa8e1450da46dd5781cc2accd8d0d2cf832a2e
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 0.9997

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://trafffe.ru/strik?utm_term=kerem+b%25C3%25BCrsin+age PDF link annotation
    • https://maxubuzidam.weebly.com/uploads/1/3/4/4/134486229/vopuparivapu_sepumafijalate_wajafaduxinovuv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404108/normal_5fb8cb434e819.pdfIn PDF document text
    • https://wamebadafexu.weebly.com/uploads/1/3/4/0/134040762/mugadosefo.pdfIn PDF document text
    • https://xajoxivanuxus.weebly.com/uploads/1/3/4/4/134432241/wagebupesebitupifigu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379485/normal_5fae84c050c0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368752/normal_5f98e9199cd0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371800/normal_5f8eab7cb755a.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/344e4112-06a7-488e-8af9-f79fa2b4c34f/89275536755.pdfIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/allahabad_kondapuram_songs_com.pdfIn PDF document text
    • https://s3.amazonaws.com/regegozumekoza/mirewu.pdfIn PDF document text
    • https://s3.amazonaws.com/gopuze/ruger_air_magnum_22_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3d11796-15f4-4151-9b20-a091a7d5a1a1/trash_gang_wallpaper.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/goudy_std_bold_font_free.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d59f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59F 5200 bytes
SHA-256: 616e680c0007602bbdb4d16c0d353d8688d40ee764f6c18b3552d7116a5fcc24
font_01_sfnt_off0000e707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE707 13456 bytes
SHA-256: 46fd9f255f49632ae84485ce1fc9eca9ca27e9edbd67f2345e398689bd91e300
font_02_sfnt_off000110f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F6 16384 bytes
SHA-256: a8f82ce1cdc57d6cf73caeb35ba0a534b8f114798d4dfc5d6ed82df03316e49d

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