Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ac7bdd7199e667c…

MALICIOUS

PDF

60.4 KB Created: 2020-11-24 13:12:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: d8a3e7b63acca844d4db3079d836cb56 SHA-1: 101e9cc30090348db315dc88df34b72eb4b1c050 SHA-256: 6ac7bdd7199e667cd36a28b05c2acb9223fec1f691b93a141e4ecd353ca218f4
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9995

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffnew.ru/123?utm_term=master+yi+guide+s7 PDF link annotation
    • https://ganubosi.weebly.com/uploads/1/3/4/5/134506756/4206020.pdfIn PDF document text
    • https://mujubafajereked.weebly.com/uploads/1/3/4/5/134595908/detitoj-zixafedusuxidi-nokexiwuranagoj.pdfIn PDF document text
    • https://sonadenazutimiw.weebly.com/uploads/1/3/4/6/134654654/7748438.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392649/normal_5f9c178762ac5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448347/normal_5fa000d36a295.pdfIn PDF document text
    • https://bogadisosupotaj.weebly.com/uploads/1/3/0/7/130776541/vinase.pdfIn PDF document text
    • https://dinumaditu.weebly.com/uploads/1/3/4/4/134479473/lazejekegamijogonibo.pdfIn PDF document text
    • https://vagomonezupu.weebly.com/uploads/1/3/4/4/134403629/kasovawumo.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/jimugivos/gesutosogadexamudo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d5f111d-94bd-4f2b-a829-8ba1da373ade/23473384285.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/836dbf8b-5810-4b00-9812-63b0d119246a/mularewaporaxumogute.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_off0000b396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB396 5148 bytes
SHA-256: 9a880c2a9f4cc135a8a533cd1c253ed9ee2e9fa6df17a4511bac8adf22c50acf
font_01_sfnt_off0000c540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC540 9392 bytes
SHA-256: e3b2eaf72512fb62bb322b5b0e0b78fe6242a48625f06a677d694548a7078667

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