Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c2c25ad14da7866…

MALICIOUS

PDF

33.0 KB Created: 2020-11-06 16:47:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: f1abb7ebfe833f38a70b753ea88dd984 SHA-1: dfb22c0ee41618c0941c049883e024c0febb6694 SHA-256: 4c2c25ad14da7866b65f9939533631064f939e072798252784438ab4fbadd0f5
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://trafficel.ru/aws?keyword=audiovox+movies2go+dvd+player PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416321/normal_5f95bb4bc6555.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fanunopufimu.files.wordpress.com/2020/11/27552035983.pdfIn PDF document text
    • https://fogisunewada.files.wordpress.com/2020/11/3413958129.pdfIn PDF document text
    • https://bufuvuxigul.files.wordpress.com/2020/11/suvasemerozusew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c297d9b8-bcf5-43f2-9978-9485d16aa519/difference_between_prebiotics_and_probiotics.pdfIn PDF document text
    • https://manetomimexa.files.wordpress.com/2020/11/68091325827.pdfIn PDF document text
    • https://wubazij.files.wordpress.com/2020/11/59804519021.pdfIn PDF document text
    • https://pokavewizux.files.wordpress.com/2020/11/59291350974.pdfIn PDF document text
    • https://pazeden.files.wordpress.com/2020/11/86767518253.pdfIn PDF document text
    • https://matodokabaj.files.wordpress.com/2020/11/kopagomu.pdfIn PDF document text
    • https://jopafez.files.wordpress.com/2020/11/zirebenimanonif.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_off00004124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4124 5632 bytes
SHA-256: e64e6108df0e913659789ec8dfa1c55b443fd7206eec12a461881ca4d749a587
font_01_sfnt_off0000544b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x544B 10340 bytes
SHA-256: aa8e47de9e0f0ab8a3f2176fea6379ae790db5394cd4c7934f9a0aeb13213d47

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