Malicious PDF — malware analysis report

Static analysis result for SHA-256 99e1cbd2575d6ad3…

MALICIOUS

PDF

76.5 KB Created: 2021-04-02 04:40:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 29a977849e4062149b011a1f9944cb2c SHA-1: cc22a9faa8bf95e201ee88eb96b8f084e11a4cc0 SHA-256: 99e1cbd2575d6ad3c69c9458fca18deafe63ad2f8933668bcbdc8e6b18e56e43
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains a large number of external links, many of which point to disposable hosting services, suggesting a link farm designed to distribute malicious content. The presence of a PDF_SEO_LINK_FARM heuristic firing and the ClamAV detection of 'Pdf.Phishing.Trojan' strongly indicate a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains references to 'pnpa application form pdf download', likely a lure to encourage users to click the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://mezovuduw.ru/award?keyword=pnpa+application+form+pdf+download PDF link annotation
    • https://cdn.sqhk.co/lawipavoso/eJsgijf/lumevozazet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481509/normal_5fe3e474971a9.pdfIn PDF document text
    • https://cdn.sqhk.co/wenegifuteg/jayifnN/54451839451.pdfIn PDF document text
    • https://cdn.sqhk.co/xutazazo/s1RFggf/battleship_cast_list.pdfIn PDF document text
    • https://cdn.sqhk.co/risubibasero/Siggjji/nugget_ampas_tahu.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusetoteji/jgxMuLT/2005.pdfIn PDF document text
    • http://opssmall.space/file_from_blob_storage_javat8g45.pdfIn PDF document text
    • http://virona.org/on_my_block_cast_spooky_brotherab09c.pdfIn PDF document text
    • http://mp4.design/bubly_sparkling_water_nutrition_informationo3zci.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455183/normal_6035616975e25.pdfIn PDF document text
    • http://senenetikoxikom.22web.org/facade_structural_design.pdfIn PDF document text
    • http://razvivatel.blog/8622662560694s0n.pdfIn PDF document text
    • https://cdn.sqhk.co/zikonidenijo/doWILi0/idle_rapper_empire_hiphop_simulation_game_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mavafakubew.epizy.com/antitrust_movie_free.pdfIn PDF document text
    • https://47e244ab-6b1f-4ae7-97e8-86de5b619f9f.filesusr.com/ugd/e1d12c_26dcdeeb7d254f30849f9183851cbb79.pdf?index=trueIn PDF document text
    • https://4228e3e8-6e56-436b-9c2a-5710a6c3a216.filesusr.com/ugd/e32dc8_ed5810ccb8fb4f44bcb414dd525632e5.pdf?index=trueIn PDF document text
    • https://b3a8b944-ddec-4d17-9b53-5a1c05c66d8c.filesusr.com/ugd/314503_dcc9a60d15884ee0886ab34a7aebe805.pdf?index=trueIn PDF document text
    • http://numifugok.rf.gd/pobovidenun.pdfIn PDF document text
    • http://wukosinigi.epizy.com/49132167609.pdfIn PDF document text
    • http://fidekejasogam.epizy.com/escala_apgar_y_silverman.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BD 5216 bytes
SHA-256: d023dccf2273f0ad90baec17771b3a7fb6ebbdf0d96a46865860e028600595ba
font_01_sfnt_off0000fb7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7A 12644 bytes
SHA-256: 606a723e447f1f80b9d83aec5e33b607c0bc7deedfb2f2c6dbe0d7c57f96e289

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