Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b521a2a17329ce5…

MALICIOUS

PDF

42.9 KB Created: 2020-11-08 00:05:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: e0d42f657ea97e4222e8311382cd5df2 SHA-1: de05468e9b239358c77291fde2620a47ea978fa7 SHA-256: 8b521a2a17329ce5e72e16c7d4d8afef5f6f6e6525a487422c03a9ca50ab9619
66 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 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 4

  • 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://traffnew.ru/aws?keyword=briggs+and+stratton+engine+parts+manual PDF link annotation
    • https://majijajivetik.weebly.com/uploads/1/3/4/2/134265766/jevijefepe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373502/normal_5fa71953f3554.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/figugipopar/total_people_plus_ingredients.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e57d9cd-a618-4e93-9d99-11d01db09079/watch_all_in.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/rupapizovitebav.pdfIn PDF document text
    • https://nolaribam.files.wordpress.com/2020/11/56255733677.pdfIn PDF document text
    • https://s3.amazonaws.com/napisakaluja/26707220119.pdfIn PDF document text
    • https://dinevuwe.files.wordpress.com/2020/11/voxawizawugugimux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0e5adb0-fd91-4033-a76b-69f31e37d079/dosam.pdfIn PDF document text
    • https://lusabun.files.wordpress.com/2020/11/toyota_22r_4x4_extra_cab_guatemala.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/zagutapixe.pdfIn PDF document text
    • https://deziviw.files.wordpress.com/2020/11/47673258285.pdfIn PDF document text
    • https://s3.amazonaws.com/genedesowul/to_kill_a_mockingbird_important_quotes_chapter_10.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_off00006671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6671 5328 bytes
SHA-256: 8320b002ff4fac647eb667c418202fa93db3d2e8b8fb44808df27c6e1284d5c3
font_01_sfnt_off0000787b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x787B 11252 bytes
SHA-256: fecf221f262f4019669f7fb0a835ea8b875a377278ead1dc496634bdfdd48e04

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