Malicious PDF — malware analysis report

Static analysis result for SHA-256 796f1cbc970376a3…

MALICIOUS

PDF

76.1 KB Created: 2020-12-21 05:02:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 03495e95a0e6cc75b26e1e86430f0b3b SHA-1: 9c8130bbe3afcdf197f48b53f3785473f1daa631 SHA-256: 796f1cbc970376a3eb660c4bfd776d16edf3e4d8c09eccf1438efbb1a7a4ece7
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=consulting+math+drills PDF link annotation
    • https://getedizexagan.weebly.com/uploads/1/3/0/7/130740146/rosunakop.pdfIn PDF document text
    • https://lozezuxugi.weebly.com/uploads/1/3/4/0/134016676/kanexasi.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://s3.amazonaws.com/divexikav/numeros_primos_ejemplos.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5174de5c7695ca9b695f8/t/5fd6cbe93ebe0416317016fe/1607912428276/6715926564.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/fenokizibeboxated.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33f4e8b0-261f-46a0-a758-516da14a2b27/33880805170.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1a5bad8-8b7a-401a-a03b-9fd1760b0d02/bazanabosexuva.pdfIn PDF document text
    • https://s3.amazonaws.com/wemazun/actors_access_larry_a_davies.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/gta_manual_san_andreas.pdfIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/forabeg.pdfIn PDF document text
    • https://s3.amazonaws.com/belopudevuzuza/62500401299.pdfIn PDF document text
    • https://s3.amazonaws.com/sikuva/passagem_de_sonda_vesical_de_demora.pdfIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/canon_l11121e_printer_software_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tapelu/pigerudofedenewalofevun.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_off0000e067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE067 5028 bytes
SHA-256: fcdc208e10bd98332399e4535ab6dcc6c9843e90e1a698d2ab70933e617a6148
font_01_sfnt_off0000f141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF141 10516 bytes
SHA-256: f395141e0893e6b3854ef65a9a60a3bede3c34a9b0710c52d738f8c6a7b028a3
font_02_sfnt_off0001153a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1153A 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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