Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b21eeb714ecbcd3…

MALICIOUS

PDF

64.1 KB Created: 2020-12-18 04:16:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 8236a47ec6fdb9d205dc9ff0d0ab4fda SHA-1: e6a1e4da3dca97a3882f1d0c34480e7087310d1f SHA-256: 8b21eeb714ecbcd3972a71914bff372b12da959c5d9b339c7dcd2454e9214df0
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO link farms or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' suggest the document is designed to drive traffic to external, potentially malicious, web pages.

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://traffset.ru/123?utm_term=k+cup+variety+pack+costco PDF link annotation
    • https://wosobariwosamu.weebly.com/uploads/1/3/4/3/134372044/8a94cf301405f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379217/normal_5fa00a2626043.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454547/normal_5fa537645707c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376086/normal_5f8f3864bf443.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382189/normal_5fa774adcd558.pdfIn PDF document text
    • https://vimiwegom.weebly.com/uploads/1/3/0/7/130775837/2c190cc61ace09.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/5464c50e-b821-4c4e-a208-43a39ff01871/fumutilapap.pdfIn PDF document text
    • https://s3.amazonaws.com/vipuxafol/2615247612.pdfIn PDF document text
    • https://s3.amazonaws.com/suxuzubojut/zepelapaniwilozedumovibi.pdfIn PDF document text
    • https://s3.amazonaws.com/wefadep/52514019395.pdfIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/20670228042.pdfIn PDF document text
    • https://s3.amazonaws.com/davawina/4432279898.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0ca713a-4084-4d70-a5bf-ca7cf74a21e6/ilmainen_Microsoft_excel-lunttilappu.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc342e327a199023ac4b189/t/5fc70eeaa3696915e21c25bc/1606881002143/spelling_and_grammar_check_word_2010_download.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000afa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFA9 4868 bytes
SHA-256: 7dbf7a8d146faa59e259dea31c6ba1d10a669431b8ccd21f46ce6a5138dc7a38
font_01_sfnt_off0000c05b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC05B 10464 bytes
SHA-256: 5bf80cde4bb9b81742513e28012579f087a1da9d0785fc718130d6f1b133bfc7
font_02_sfnt_off0000e402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE402 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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