Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c24be7da718eba2…

MALICIOUS

PDF

71.6 KB Created: 2021-04-02 12:33:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 641a5ce03e75a39415f4ee19d58e807d SHA-1: 3edd831ad36d67b0060f265d47bdd634583fb24f SHA-256: 5c24be7da718eba2cc1ee86536ad51a35221538d22f4242b88ccbe40383b50d8
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO spam or phishing campaigns. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of links, and the 'ML_NYX_PDF_MALICIOUS' score is very high. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure suggest an attempt to redirect users to malicious or spammy content, potentially for credential harvesting or ad fraud.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/wix?keyword=cvuhsd+student+portal PDF link annotation
    • http://avto-document.site/kisurrfjyj.pdfIn PDF document text
    • https://cdn.sqhk.co/foroboreb/jfyj4hg/58247581307.pdfIn PDF document text
    • http://migerov.xyz/pokemon_y_iv_breeding_guide5uojn.pdfIn PDF document text
    • https://cdn.sqhk.co/bulixanejad/NbhhieP/i_play_american_football_in_spanish.pdfIn PDF document text
    • https://gorejirulikem.weebly.com/uploads/1/3/4/7/134738880/dopiduzikoneveko.pdfIn PDF document text
    • https://tosojeravi.weebly.com/uploads/1/3/4/6/134617838/xidurunuxusizofizu.pdfIn PDF document text
    • https://wimavebitajiki.weebly.com/uploads/1/3/4/6/134609796/lifekoxetowi_supapopo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/falevi/how_much_does_it_cost_to_rent_a_paint_sprayer.pdfIn PDF document text
    • https://c5c1e25b-3ca9-4f8f-aecb-0ee3b29cb37b.filesusr.com/ugd/f4fe7b_20b4b34e019f4c61b239ed9bac3d35df.pdf?index=trueIn PDF document text
    • https://2df275fc-a8dd-466e-be95-33fe0afe7bed.filesusr.com/ugd/9b6d1e_c24a2dc914114a68848650392404eedd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dopugaxelelema/movimiento_circular_uniformemente_variado_caracteristicas.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/binosut.pdfIn PDF document text
    • https://cd29ef07-728f-4a0b-b57b-23e770395c36.filesusr.com/ugd/f14cf6_373c34b0e6a14a64903bb5a810ba7d19.pdf?index=trueIn PDF document text
    • https://1cf095b7-1d29-4152-b82c-7733cf7ba0c7.filesusr.com/ugd/c1de29_9ae736b5b10244259434c04ebfa8a257.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gavexilatuvitaz/whatsapp_for_windows_8._1.pdfIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/davinci_resolve_tutorial_editing.pdfIn PDF document text
    • https://27475d5a-2981-497d-8cd5-0c310ef10f8b.filesusr.com/ugd/9cb927_c4373fa1939045faaeca600861579898.pdf?index=trueIn PDF document text
    • https://4541bc1c-e35c-4de3-bb44-1f53c3e1a56d.filesusr.com/ugd/68f66e_cc23e39158464a7fa3800e2d0d971dea.pdf?index=trueIn PDF document text
    • https://0f285ee0-1b14-49a2-8a3e-060a2db94812.filesusr.com/ugd/4bf67f_739aa85b354e4fc6b1435f1d71b0db4c.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE15 4964 bytes
SHA-256: 6001540b6877952af1af7b9435482a47e9dcff674edbfce832bd4fdb60771b66
font_01_sfnt_off0000dee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE9 10708 bytes
SHA-256: c9993ba1d8c24b03ec24523d5840c095382d83d8584577f7f007b670db3c192a
font_02_sfnt_off00010385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10385 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3