Malicious PDF — malware analysis report

Static analysis result for SHA-256 662a97d5fce4ef55…

MALICIOUS

PDF

76.3 KB Created: 2021-02-25 17:52:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 1a4e269081ae6af7b29c9ecd9fdda32f SHA-1: e934543dba8a91d994c93ea0d0bdeeeb26e5b574 SHA-256: 662a97d5fce4ef55209f78885250e5e59b57b103468da980b7c87c2c81d99c97
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs, with one prominent URL pointing to 'https://crophysi.ru/award?keyword=percy+jackson+the+heroes+of+olympus+book+set'. The PDF's structure and the presence of many external links suggest it's designed to redirect users to potentially harmful websites, fitting the pattern of a phishing or malware distribution lure. No scripts were extracted, but the PDF's nature strongly implies an attempt to exploit user interaction via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://crophysi.ru/award?keyword=percy+jackson+the+heroes+of+olympus+book+set PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4502248/normal_5fe6261c9dc64.pdfIn PDF document text
    • http://zanartcc.net/7892256401t21tg.pdfIn PDF document text
    • https://cdn.sqhk.co/lamajemomu/giohbPl/jasmine_green_bubble_tea_calories.pdfIn PDF document text
    • http://weareanonymous.org/vukulukewudepuweturplfd.pdfIn PDF document text
    • http://tehnotop.space/5047323439pqesf.pdfIn PDF document text
    • https://cdn.sqhk.co/dedesonor/jeiPijj/vertical_ninja_jump_free_download.pdfIn PDF document text
    • http://lestyprin.online/26442127717gqeis.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368229/normal_6000c9321813a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450884/normal_5fe8b546a3d1d.pdfIn PDF document text
    • http://denarop.22web.org/vemunokabawasibuxibem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446497/normal_5fdba7c850537.pdfIn PDF document text
    • https://cdn.sqhk.co/disegivoji/ibsjcgg/39001895260.pdfIn PDF document text
    • https://cdn.sqhk.co/miwiwefe/2gjrRjq/roku_account_monthly_cost.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380705/normal_600e23d3e7a75.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xujogefup.rf.gd/maximum_ride_book_3.pdfIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/bixalenitolesax.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA16 5636 bytes
SHA-256: f36f14967810aac784ceb4262b168ed9800e03db96c9f80351c89ff148745f11
font_01_sfnt_off0000fd26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD26 15392 bytes
SHA-256: f3f7a619f3a54b9b3163d7ec394e634021c84ee41c0451835710086d9bf39d65

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