Malicious PDF — malware analysis report

Static analysis result for SHA-256 99629f660a20cdc4…

MALICIOUS

PDF

78.4 KB Created: 2021-05-08 22:25:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4b62f87d89424f72517e4f0f5a580cb1 SHA-1: c7a8f7b99b9439bf6e546e0d25f1a16c9fa277e0 SHA-256: 99629f660a20cdc4c9d10af006658216bd3ed65319f764ab6620e19796aedada
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 numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a common phishing lure, likely aiming to redirect users to malicious sites for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/strik?utm_term=why+mercutio+and+tybalt+fight PDF link annotation
    • http://amin-ukraine.net/dotisogizatofumk0ck.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371261/normal_600bf8a51681a.pdfIn PDF document text
    • http://ijmalan.xyz/jofezidezexosiwogora5j1ub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382643/normal_603bd78d64c47.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374956/normal_5fe2ade8ef10f.pdfIn PDF document text
    • https://cdn.sqhk.co/bosejadukifo/UrYwjiG/ayyappa_songs_kannada.pdfIn PDF document text
    • http://copyright-supporthelp.com/hygromanteia_skinnernkr94.pdfIn PDF document text
    • http://cooldomen.space/boruvibezoderodoj71jt.pdfIn PDF document text
    • https://cdn.sqhk.co/foxoxaze/gjaYhah/6231207189.pdfIn PDF document text
    • http://itfamily.pro/dazaruni7dq2w.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453103/normal_600cc1c58e392.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a0c587e-cbdd-4b3f-8ab4-fc2f87e68288/24667503816.pdfIn PDF document text
    • https://s3.amazonaws.com/xamapebonijos/bitmap_image_size_android.pdfIn PDF document text
    • https://s3.amazonaws.com/tumuzu/respiration_in_frog.pdfIn PDF document text
    • https://c216880a-03a2-4774-ab7e-121c93799e8f.filesusr.com/ugd/b5aed9_b7d8cd7bf2984b2bb8185f8d92f8fd4f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8594861-1939-4d44-b08e-9bbab9e9d53a/88002492335.pdfIn PDF document text
    • https://d4bcd744-2348-4fe3-9006-05b2fcbd3cbd.filesusr.com/ugd/704566_0b436a320ce34c839711444fc48d2810.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/childe_harolds_pilgrimage_italiano.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 4

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_off0000f514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF514 5512 bytes
SHA-256: 6df79f6111afe6bbc2ef2470bbf20945dbbae4be8e6154bd0f81645bb64f288a
font_01_sfnt_off000107bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BD 10664 bytes
SHA-256: b29612a0f877d75f5e42e73bb9e3230ad4a6572818798c5ab7522c041c48bdc7

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