Malicious PDF — malware analysis report

Static analysis result for SHA-256 50221fad537d013a…

MALICIOUS

PDF

87.2 KB Created: 2021-02-12 04:18:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c5f7b7ac2fdccb6779e83dbdefd0cd7a SHA-1: 6d5b62edfee84d6ac534bfdfee639ea736800be6 SHA-256: 50221fad537d013af1ff8d4438af231934ee63cdf0ced93294e6f63bab356afd
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were explicitly extracted, the presence of numerous external links suggests an attempt to redirect users to potentially malicious websites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://druttle.ru/wix?keyword=aura+kingdom+classes+mobile PDF link annotation
    • https://cdn.sqhk.co/fotenulutis/0jcQgiA/dropping_a_tennis_ball_physics.pdfIn PDF document text
    • https://vijisazegogufob.weebly.com/uploads/1/3/1/3/131380966/88e2f7b090.pdfIn PDF document text
    • http://matras-24.ru/99148405495s8vaf.pdfIn PDF document text
    • https://cdn.sqhk.co/sewujuzanas/hfjaeEh/personal_ringtones_galaxy_s9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496811/normal_600418386bc0a.pdfIn PDF document text
    • https://cdn.sqhk.co/jesupasuzoku/jgfhjSE/pocket_watch_repairs_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/golomamone/V8ouHhg/28593911669.pdfIn PDF document text
    • https://cdn.sqhk.co/goganededem/ijXFn8a/20962697777.pdfIn PDF document text
    • http://basvuruizleme.online/leckie_and_leckie_higher_french_success_guided5odz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445321/normal_6009c21e608f6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366630/normal_5ff7856336e09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426687/normal_600ddb3f038cf.pdfIn PDF document text
    • http://all-gopro.com/15013069202ad7fp.pdfIn PDF document text
    • https://cdn.sqhk.co/ninujamezol/geFlhhV/jazagegofewubezelozave.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370525/normal_5fdbe1d2e82e8.pdfIn PDF document text
    • http://insta-sale.site/34219067147ecpec.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C2 5452 bytes
SHA-256: 1a3537b04899704589672b0a60e7bf31d13471c1e4a99cb89b50d4732a551b3b
font_01_sfnt_off00010c2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2D 1948 bytes
SHA-256: 3775f1277d79cffd6c55adc73710ea8a48b6ee76df829cbff88df72ec20fe8d6
font_02_sfnt_off00011589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11589 10720 bytes
SHA-256: 86ace491651cb985b1cbc254a8c9d6464aed2ad7fff9805cc814eb02ebcffae6
font_03_sfnt_off00013a60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A60 16092 bytes
SHA-256: c9557d91917e40dbb2ce09b7ef560a04a9a832ffe2ebcac6b50408a58351272e

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