Malicious PDF — malware analysis report

Static analysis result for SHA-256 4740a39aec90fc1f…

MALICIOUS

PDF

134.5 KB Created: 2020-11-28 07:19:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: fe8bc0bf45a4b44f4c99f6a5051a4f28 SHA-1: dadf9ab91c953066c5b821ed50dd12fdb7b71251 SHA-256: 4740a39aec90fc1f5a8472a09a4c5310e93263cca8b102a5fccdb305525c96a1
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://trafffi.ru/123?utm_term=fish+species+star+wars PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375194/normal_5f8ca3ad7c73f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492272/normal_5fc1c66f89969.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367290/normal_5f89f9ff0e87f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470537/normal_5fa4c2fbb1669.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381344/normal_5f9a82cbd38f5.pdfIn PDF document text
    • https://zabidikigez.weebly.com/uploads/1/3/4/5/134594795/cb8297c9fed00.pdfIn PDF document text
    • https://fumubesoxumus.weebly.com/uploads/1/3/4/4/134485348/578d87ab31c6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365536/normal_5f86f55e02229.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/eeb8dc35-5206-498d-9c6e-61da4a0ff0e7/85353226215.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b7e548b-e053-475f-9d0d-a8ee894e97a6/pufefilumerimuleliri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23577bef-fdba-4ec2-9c6d-f0ea41ba8b69/lamogatirir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89c268e9-adea-46bd-a7c1-4d15cf3dd692/56874355442.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/hypixel_skyblock_dragon_armor_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d08d9ae-6b2f-47e6-96ec-b86a98902c0c/3racha_placebo_eng_lyrics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79afe931-5ff9-4c63-a8a3-b46640aa74b6/vabirukexa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5a3b915-33ef-4a8c-932f-f08d1c1b4f99/fred_bear_compound_bow_serial_numbers.pdfIn PDF document text
    • https://s3.amazonaws.com/gulapore/kebuxawirutisilil.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001d5ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D5AD 5036 bytes
SHA-256: a1914ff9962381ed76d70bfc7e9f5af4c28dbf0c8f7b185663214c449cac328b
font_01_sfnt_off0001e6df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E6DF 11040 bytes
SHA-256: de4de95ca24fe1f86ca4f7aeff707e977131e3e591683e0631ea69762f8d4790

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