Malicious PDF — malware analysis report

Static analysis result for SHA-256 8964f20d70e7843a…

MALICIOUS

PDF

103.2 KB Created: 2021-04-18 21:09:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: bf08495744ff2325c0638d85e13849c2 SHA-1: 4c3bf7dcf2b69d22b7873125d4a5e5bf5bf64f0b SHA-256: 8964f20d70e7843a7b2d6ee5380cf4707c4b8b559e8a1a7e3ab5dca462d59d92
126 Risk Score

Malware Insights

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

The PDF file contains numerous external URIs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect the user to a compromised site for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://maypoin.ru/strik?utm_term=2015+lexus+gx+460+review+car+and+driver PDF link annotation
    • http://fesurowejo.mywebcommunity.org/tegika.pdfIn PDF document text
    • http://fobativ.mywebcommunity.org/wevexopakezisulimuweso.pdfIn PDF document text
    • http://kojijeku.mygamesonline.org/23859473507.pdfIn PDF document text
    • http://suporefebakibur.mygamesonline.org/53598859492.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414488/normal_601620321d166.pdfIn PDF document text
    • http://vosojivaru.mypressonline.com/26054510526.pdfIn PDF document text
    • http://lexaxak.mywebcommunity.org/jizuloxatazumez.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427094/normal_600431ce4475a.pdfIn PDF document text
    • http://timinome.getenjoyment.net/carranza_13th_edition_download.pdfIn PDF document text
    • http://bitunowaluf.sportsontheweb.net/gagobemewebiboxozibipubu.pdfIn PDF document text
    • http://luziniwanemek.sportsontheweb.net/write_a_paragraph_about_yourself.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465123/normal_605569951784a.pdfIn PDF document text
    • http://doxalasi.mywebcommunity.org/how_to_add_a_to_my_wix_website.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vidugozu.atwebpages.com/application_letter_for_the_post_of_a_teacher.pdfIn PDF document text
    • https://adc0bc6f-2b4d-4951-bce0-9128d215fa34.filesusr.com/ugd/5ea4d5_34f53696a28f4c1ab7d3eda502050342.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/venunamazozuzo/why_wont_my_washing_machine_heat_up.pdfIn PDF document text
    • https://a1c9bafd-2917-4c1b-b79c-a4b44a941470.filesusr.com/ugd/f0f215_d9d9c0f2016f4ec2ae4c6644128681e9.pdf?index=trueIn PDF document text
    • http://titugol.atwebpages.com/lolumapipopekipoxadatu.pdfIn PDF document text
    • https://2863666b-9d79-467d-9aad-9eeb6dafbdf2.filesusr.com/ugd/6ee3eb_e509fee0e62b467d8a6ef38814998668.pdf?index=trueIn PDF document text
    • https://4dd4a32c-aced-41d2-87e6-7ff9ca8080d7.filesusr.com/ugd/6d6f33_27c856429cf7415fa0e38946835b6960.pdf?index=trueIn PDF document text
    • https://52ed6390-a5c1-4502-9f93-599cf6d98ad1.filesusr.com/ugd/f7fbc8_e0c6d2fa65644353bbfc54d3606dbb95.pdf?index=trueIn PDF document text
    • http://fajenadiwizowo.atwebpages.com/36547840034.pdfIn PDF document text
    • https://s3.amazonaws.com/nitizobuv/purple_cow_root_beer_float.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12488 6684 bytes
SHA-256: 1bf03e0459f8a47fe65f40bcce3919b0f8c40220af96d693e8c5495cf5a9b2b1
font_01_sfnt_off00013b5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B5E 5924 bytes
SHA-256: e99e83adf291e49a8f585b56e3c0963215156e810221c839168eb43980ac04f5
font_02_sfnt_off00014fbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FBC 11604 bytes
SHA-256: 36db2c24e26e81580aa1699eebb1eef2573acaf300044fef037be3be414dae65
font_03_sfnt_off00017775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17775 16088 bytes
SHA-256: f8457f22a3fb8d491e8b040b3c54ad97f1d50af2be765620f928baa692e9c0ff