Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dfaa32c355ee287…

MALICIOUS

PDF

72.0 KB Created: 2020-11-17 16:05:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 71115ba99b3677d1d8326333eb5c47af SHA-1: d135a817cf2e0134365cecd846d4ba3e5049ec33 SHA-256: 7dfaa32c355ee2875ae7a3373b954de6a99d021a75b78f37983735411522cbda
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-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://trafffe.ru/123?utm_term=nancy+putkoski+bourdain PDF link annotation
    • https://jevikefogonilij.weebly.com/uploads/1/3/4/7/134747067/3355156.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366367/normal_5f935ae577be8.pdfIn PDF document text
    • https://nogomikosisodop.weebly.com/uploads/1/3/2/6/132681488/rizotexejipitojetul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419451/normal_5f9c10cccb190.pdfIn PDF document text
    • https://tavumake.weebly.com/uploads/1/3/2/7/132740551/latidetovuweri.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383689/normal_5f9be96569c76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404723/normal_5fa498c2c3d14.pdfIn PDF document text
    • https://wejakoguxi.weebly.com/uploads/1/3/4/3/134324676/nawebepolujajeb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a27c4f7a-4fe7-4ccc-a274-d46b32f8be59/max_lucado_descargar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0b651a8-62f1-406f-b9c1-8121d4a01c63/best_8_inch_tablet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04aee994-a1ea-4371-96fe-b736a8e411b8/wujamugixu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc6df73f-bc2f-4d75-95bb-faa6a6f6b866/93660412929.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32479116-d26d-4295-b9ef-bf0398435e9a/65219015962.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_off0000db41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB41 5308 bytes
SHA-256: d29970891b3fa602e0c577350a0c21a8115a50ab8b5b1329c055be54c8cd2e8c
font_01_sfnt_off0000ed66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED66 11272 bytes
SHA-256: 7888f13855043fed22da3f5a8cc6ed2c89a7969f91d4511f432e181ea9d9cc16

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