Malicious PDF — malware analysis report

Static analysis result for SHA-256 899b1700d24a5612…

MALICIOUS

PDF

36.4 KB Created: 2020-11-07 21:05:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: ee3b97f5715347579b240f9c297d2a63 SHA-1: 1765526cf91c4f4d79ee948dde367afe5ef8c340 SHA-256: 899b1700d24a5612469cccad56921e54250a7120872efe366b8a13d493001f77
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://traffking.ru/123?keyword=search+inside+yourself+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365659/normal_5fa08bbfdc746.pdfIn PDF document text
    • https://xisubuto.weebly.com/uploads/1/3/1/3/131380177/vunisu.pdfIn PDF document text
    • https://lilawowawumoxo.weebly.com/uploads/1/3/1/4/131453384/786957.pdfIn PDF document text
    • https://luvepuxoworusoj.weebly.com/uploads/1/3/4/6/134660421/c4a5d16.pdfIn PDF document text
    • https://vifaniju.weebly.com/uploads/1/3/4/5/134507083/rupuvunisira.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://kuzosetaz812614874.files.wordpress.com/2020/11/black_ops_2_level_hack_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/farezelof/duzoresofolurejasa.pdfIn PDF document text
    • https://nelavikix.files.wordpress.com/2020/11/73736449421.pdfIn PDF document text
    • https://finasaz.files.wordpress.com/2020/11/33669283505.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14bdeda8-1564-4dc6-851f-5a4388a85f2c/xolawenib.pdfIn PDF document text
    • https://jopafez.files.wordpress.com/2020/11/weworabaduden.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/19097143946.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_off00004e4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4E4B 5448 bytes
SHA-256: 18a8bbb673cfcce7045201528eb6b7fef37b55c2a3d248f01b9ce3ae0484f0ff
font_01_sfnt_off000060d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60D7 10644 bytes
SHA-256: 6066ea54027a9d63351684dc3337431c22d36e90a9cbbc48bb3cfbf68e3d8cfb

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