Malicious PDF — malware analysis report

Static analysis result for SHA-256 db044c0948387d95…

MALICIOUS

PDF

66.1 KB Created: 2020-11-19 12:00:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 51c9c5f23d61cef350b0c43fc78db021 SHA-1: 10bc68b04e093c2d9b2b191d6048948354457012 SHA-256: db044c0948387d95947c2bb33292703efe61b50b934df6eb4c38930a1d7164b5
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://trafffi.ru/123?utm_term=escape+plan+2+full+movie+free+download+in+tamil PDF link annotation
    • https://vopipogumibuwel.weebly.com/uploads/1/3/1/4/131453394/155db859849b5a0.pdfIn PDF document text
    • https://rosikotukixaru.weebly.com/uploads/1/3/4/3/134312973/8981708.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382779/normal_5fa7bb6f86338.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485434/normal_5fb6069c63cc9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389074/normal_5fb4aa605d632.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404103/normal_5f9db6a28d68b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426945/normal_5f9a19a61e7de.pdfIn PDF document text
    • https://zigamebujadosa.weebly.com/uploads/1/3/4/7/134745820/sidasukes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407664/normal_5f9ea34a59441.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391314/normal_5fb2b711c7b69.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/b9727c4a-ba73-4252-b261-247c93fe1037/96799757399.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9d5f471-aab2-46bc-bb18-f7abbd4cf6b5/litefarufolu.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_off0000c481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC481 5544 bytes
SHA-256: 31638700fac7f7028eb35011fe4e3720350ffe51a16ef50eb890d531ed354875
font_01_sfnt_off0000d768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD768 10596 bytes
SHA-256: 39a2e21c7f7dd66058fec28312e0b47e51e2773edbb72295f4119c0719c5715d

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