Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f75872b935764af…

MALICIOUS

PDF

74.9 KB Created: 2021-03-19 18:21:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f9c237b07952bcb0e15b87967ed22ab0 SHA-1: 510e31accf3c38e5a61bfd1544385d6857385216 SHA-256: 3f75872b935764afafc46f6e446d6585310158d1f8114ffe99de5997a6ccbfd5
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://soxebez.ru/wix?keyword=minecraft+1.5.2+cracked+download PDF link annotation
    • https://cdn.sqhk.co/dujagazatad/ghvhBBn/54845789926.pdfIn PDF document text
    • http://samo-katim.ru/como_hacer_nieve_de_garrafa_de_vainilla_en_casajglzf.pdfIn PDF document text
    • https://cdn.sqhk.co/pananumujo/ejcsneY/homescapes_hack_level_80.pdfIn PDF document text
    • http://xitimudajejo.mywebcommunity.org/32111901796.pdfIn PDF document text
    • https://cdn.sqhk.co/zoraxiraga/cmgfihc/sine_cosine_and_tangent_worksheet.pdfIn PDF document text
    • http://sabumow.mygamesonline.org/coulson_and_richardson_volume_4.pdfIn PDF document text
    • http://teksol.xyz/63829211348vhmpx.pdfIn PDF document text
    • http://nesobaka7.xyz/47102280651y1prv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://63b1f34b-4847-450f-8d9a-4788d10e1cf5.filesusr.com/ugd/451a43_ac9d05a78bc04eee8a6698b8933ed56d.pdf?index=trueIn PDF document text
    • https://0fdd9f25-8366-4660-9463-376fd915ad39.filesusr.com/ugd/c16cf9_5041e05f8a15404b99aca25ac4efe9c9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f3ddd80-aadc-4872-bc06-7611404ff3b5/vicks_personal_steam_inhaler_cleaning.pdfIn PDF document text
    • https://b00f38ea-0d13-4519-ab0f-1253f0d03ca0.filesusr.com/ugd/289c5e_c0de4b3ad66845f1b683472ce8c8800f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bf07d57-c1c5-46d9-9883-e6b90b38afbe/society_of_the_spectacle_chapter_4_summary.pdfIn PDF document text
    • https://0e9c393c-9feb-4465-ae9d-4486bea7a644.filesusr.com/ugd/4b68be_0f626145deb94265814ef0a50ef15fa8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1eca7fdf-1f3b-4966-a19a-aa5bfaaab661/30-book_winnie_the_pooh_complete_hardback_collection.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53ef14d3-1fa1-4518-b04d-1df73591a064/wofudavapukumibove.pdfIn PDF document text
    • https://ba85394b-11ac-4ca4-926b-74ca936c52e1.filesusr.com/ugd/5ccfc8_195cecf91e0347a8a36e0c25af1754bd.pdf?index=trueIn PDF document text
    • https://488c2ff9-9ff4-499e-8f11-525115e20b22.filesusr.com/ugd/8aba0c_5ef00f8da9dd4f479a34b1fa2a3bf8ad.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/221be49e-cd71-464f-8851-dffaf26e7722/jp_morgan_capital_market_assumptions_2018.pdfIn PDF document text
    • https://254a6a59-343e-4b7e-907c-c4819e171fff.filesusr.com/ugd/decf6f_ee9f191c1145434298b005f12a1569a9.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD326 5340 bytes
SHA-256: 0a12428c56a233cefe6637104c643ac443c016ff8b8a580edb0032ddda73475d
font_01_sfnt_off0000e594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE594 10416 bytes
SHA-256: efd22c1547069778cee8692b51659d0d03eb294081668bcda89bb6c84f67becb
font_02_sfnt_off0001090d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090D 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd