Malicious PDF — malware analysis report

Static analysis result for SHA-256 19bc756477a62f4f…

MALICIOUS

PDF

72.0 KB Created: 2021-05-30 02:58:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a72202976ebd80b68d132251c2ba5ff9 SHA-1: 16d162e622564ca0a0b7afa12ad043a807aeab6a SHA-256: 19bc756477a62f4f10dfb1891cd3f5b08941a16dcd2d0c87f77c721e44b91dc3
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-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://maypoin.ru/strik?utm_term=how+do+you+read+a+john+deere+tractor+serial+number PDF link annotation
    • https://gosaronazaniga.weebly.com/uploads/1/3/4/8/134851605/8549040.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464871/normal_6053908a19ab1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496811/normal_6069a2f8338e7.pdfIn PDF document text
    • https://bumaxaxup.weebly.com/uploads/1/3/4/2/134235918/fabupaxemusoler_sakuxefukul_nekubumowedaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471484/normal_604861cbebb5e.pdfIn PDF document text
    • https://zamosokajuzosa.weebly.com/uploads/1/3/4/6/134651904/7a0969.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405184/normal_5ff3492f807db.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471455/normal_5ff6ad411acde.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383795/normal_5febffbd82eb9.pdfIn PDF document text
    • https://buruwezixefekiw.weebly.com/uploads/1/3/0/7/130738548/pejuvoluf-vamofa-sujaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366344/normal_5fd2040286fa8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479917/normal_605905b880996.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367013/normal_5fe9558e6c30a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388293/normal_5fce77806a710.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464851/normal_602e69afc21d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378853/normal_5fd5fddc29e59.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372963/normal_5fdff0fb5ba57.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381302/normal_5fd04582ddbca.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
    • 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_off0000cf68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF68 5432 bytes
SHA-256: 225b329e2ed52e8fef7c53f675c1b48f491291283e345ac6e7e5c0c9ffc63a3e
font_01_sfnt_off0000e1c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C6 10132 bytes
SHA-256: 8746de073d24d54bbf1459828bc0a6acf91da18d75080d2b38f7a9a52434ae7f
font_02_sfnt_off0001048a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048A 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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