Malicious PDF — malware analysis report

Static analysis result for SHA-256 45a483ad285b1e6d…

MALICIOUS

PDF

89.2 KB Created: 2021-03-18 15:57:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: dac25b0dd26275864fb91a83676176f8 SHA-1: 88074c188457fb2c80e6ef0591a5c15b68ea7f79 SHA-256: 45a483ad285b1e6d4eebfb75a3bbed003ce4034677bcdbfd8cb7990d41c4c560
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 0.9955

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://jottigo.ru/wix?keyword=magruder%2527s+american+government+chapter+6+assessment+answers PDF link annotation
    • https://xatevixi.weebly.com/uploads/1/3/4/6/134651360/vozodiba_dipuxib_faxixapi.pdfIn PDF document text
    • https://vabofofed.weebly.com/uploads/1/3/4/3/134337048/kilotikekulusi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527357/normal_603bc870f0525.pdfIn PDF document text
    • https://vosilidasum.weebly.com/uploads/1/3/2/7/132740263/3376695.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471971/normal_60164dd82e10c.pdfIn PDF document text
    • https://cdn.sqhk.co/xubupigegi/dibjhif/hello_kitty_carnival_background.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374838/normal_602a34e58fb0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392207/normal_60338a6339552.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494417/normal_5ff50c3945430.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471479/normal_5fe0340b4219a.pdfIn PDF document text
    • https://cdn.sqhk.co/tarekekog/ibdOhct/vunedewarogimix.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498983/normal_5fc7a38a0f3b3.pdfIn PDF document text
    • https://cdn.sqhk.co/bakavaxa/RVq30IV/programa_vida_saludable_sep_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/libodinidep/iLVjdhj/zarchiver_donate_apk_android-_1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370777/normal_6024baef5f736.pdfIn PDF document text
    • https://sexozubo.weebly.com/uploads/1/3/0/7/130740033/nunaruzutas.pdfIn PDF document text
    • https://cdn.sqhk.co/wisulekekij/f8gegii/university_of_montana_tuition_wue.pdfIn PDF document text
    • https://cdn.sqhk.co/jiwejujorod/Fihgbif/59435858952.pdfIn PDF document text
    • https://zakoponuzu.weebly.com/uploads/1/3/5/9/135992890/fasotavobub.pdfIn PDF document text
    • https://cdn.sqhk.co/folikulezig/Hgjibhc/91538421819.pdfIn PDF document text
    • https://cdn.sqhk.co/jabisopomuxo/hiiajbj/neo_lms_reviews.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368251/normal_5fdef66f2a159.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://711920be-b761-4f0e-a604-762b26663b16.filesusr.com/ugd/ffcbea_c7ece0d9112746dd8956b6f0fd9ade99.pdf?index=trueIn PDF document text
    • https://0eb00d84-361a-45dc-b346-1af5c8eb785c.filesusr.com/ugd/d79848_f480713d9da04f76bb9f441995cc7aa5.pdf?index=trueIn PDF document text
    • https://128fc002-9ed4-4a8f-9a6b-83b43563a9ed.filesusr.com/ugd/6812d7_cb98fd2593ab40c8b287714dc3bf2336.pdf?index=trueIn PDF document text
    • https://d71fc03c-aea6-48f7-a990-8afffb22108d.filesusr.com/ugd/3de8a6_f726dd4adff44c8292c767158e0d50d3.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_off00010fed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FED 5684 bytes
SHA-256: 45f2fa028470aa059ddf69266f9a5fc1e80368ec8c97f0be401962233dbe8edb
font_01_sfnt_off00012332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12332 10960 bytes
SHA-256: f1066752a04dbbb286f3b2a2caa634bcdcc78f6692a0cac6ce4bcacdd669e6f7
font_02_sfnt_off0001487d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1487D 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2