Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c29558b24fd9acc…

MALICIOUS

PDF

66.8 KB Created: 2020-11-13 02:07:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 42441b73c32249d90b47fd0afcb899ba SHA-1: de0e5c5ffb5ea22aa738acff83c00994ef86ce10 SHA-256: 1c29558b24fd9acc4e3d12929cf7ced6864633f60254d3c3d0a552b375ec548f
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-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://traffking.ru/123?utm_term=28+nosler+load+data+195+berger PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4476595/normal_5fa75bf83b8eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385424/normal_5f8d2c86a92aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384632/normal_5f9ec4f11bc1f.pdfIn PDF document text
    • https://finiluxexolije.weebly.com/uploads/1/3/1/8/131856594/bafirop.pdfIn PDF document text
    • https://fulipevaxavu.weebly.com/uploads/1/3/2/6/132695351/725891.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/nafibanefexex/cpr_algorithm_2015.pdfIn PDF document text
    • https://s3.amazonaws.com/luropi/coffin_dance_song_roblox_piano_sheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0e1b13c-8a7e-4d2f-a55b-a5c477404f9a/vince_camuto_clothing_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/bisute/plastic_book_bins.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/rolugovobafubema.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7a0dce4-6173-4dcb-b436-1d3919ce0ba3/45411617357.pdfIn PDF document text
    • https://s3.amazonaws.com/vunizi/womopalevudu.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/limiting_reagent_practice_problems_answer_key.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_off0000c783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC783 5696 bytes
SHA-256: 8189524dba11d55830e5f1d8242ab782d907a1d857c8e0367a7a37d28c369fec
font_01_sfnt_off0000dae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE4 10448 bytes
SHA-256: a243bc5513d83c033e13295ec8c38860e772253bbb0df2f9c8d8c0147d18fe2b

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