Malicious PDF — malware analysis report

Static analysis result for SHA-256 32ca645e69f01e03…

MALICIOUS

PDF

32.8 KB Created: 2020-11-06 10:41:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 883f0e76d0e1de8982cc4192ef380719 SHA-1: 9056111fc1eb40414f394b4a16230ca9bcf17395 SHA-256: 32ca645e69f01e0357cf4299eec7587197645eaf3cec910236118a516051d1af
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 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 1.0000

Heuristics 5

  • 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.
  • 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://trafffe.ru/123?keyword=scholastic+book+fair+catalog+fall+2019 PDF link annotation
    • https://besogedawifajop.weebly.com/uploads/1/3/4/2/134234635/713933.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449781/normal_5fa189e8c5e53.pdfIn PDF document text
    • https://bizetuxerupa.weebly.com/uploads/1/3/0/8/130873791/9314607.pdfIn PDF document text
    • https://zemodeviwiteg.weebly.com/uploads/1/3/4/3/134351550/8958171.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412173/normal_5fa47150cd6c8.pdfIn PDF document text
    • https://wekegakusujesal.weebly.com/uploads/1/3/4/2/134266445/lazupu.pdfIn PDF document text
    • https://beritugemob.weebly.com/uploads/1/3/4/3/134332724/miropamok.pdfIn PDF document text
    • https://faxipanonuk.weebly.com/uploads/1/3/4/3/134352952/7435555.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/jadudusujuje/50424032690.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/operational_amplifiers_theory_and_design_johan_huijsing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e584bd7-56b2-4f4e-8bb1-467b961830d7/62199130111.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3bcea79-362f-46dc-b17a-7abc3b8b3905/93628457443.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_off000040ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x40EC 5932 bytes
SHA-256: c4d64cee79481fdc583f6402d5a49b54d50b6398744259adf23d7f014d9d497f
font_01_sfnt_off0000551a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x551A 9788 bytes
SHA-256: b6ddc1c9c95e77c7c0476fc3993f4acf0db72326e5aa324f1ebf03b0b75abeea

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