Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf3852cb689adce1…

MALICIOUS

PDF

76.9 KB Created: 2021-04-07 23:04:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: ed1d3faec73f6d5d1a275bfe93c576c4 SHA-1: e45c51cfa4e5965c00bee52d9021696e67fffa8c SHA-256: cf3852cb689adce179ff9093e29f5fcc477fc7ffabc75c7e58f66c0d06fc537d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with a primary external URI pointing to 'jottigo.ru', suggesting a lure to a malicious website. The document body, though heavily obfuscated, contains references to 'Android robots apps' and authoring information, likely part of a social engineering attempt to trick users into visiting the linked site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jottigo.ru/123?utm_term=android+robots+apps PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4402486/normal_6059525459c90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406473/normal_5fd5ff70e2a84.pdfIn PDF document text
    • http://kiparegazeratax.getenjoyment.net/brady_bmp21_plus_manual_espaol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366018/normal_5fe4fed4f3d2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426830/normal_6054c69b23c60.pdfIn PDF document text
    • http://paxejunon.mygamesonline.org/luloruxiregipi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382186/normal_604491b7059af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502819/normal_606a91116aec6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://reroxiki.epizy.com/dutirenidibikuwelusub.pdfIn PDF document text
    • https://s3.amazonaws.com/bawalidamovidud/bapigodi.pdfIn PDF document text
    • http://newumil.epizy.com/menanadugezeseran.pdfIn PDF document text
    • https://50b7e5d6-ab0e-41ff-bbcb-47d024e5c277.filesusr.com/ugd/45d8ab_baedd2c9e29a4b6a90e306ddbad235c3.pdf?index=trueIn PDF document text
    • https://a001dc82-f31e-4944-9b76-0a8e602b6855.filesusr.com/ugd/e4ee87_4fe6193bd6fe4d739015d081a749ec62.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gumagabu/vonexifiguxebugutabek.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/listado_de_capitales_del_mundo.pdfIn PDF document text
    • http://xafepabofi.epizy.com/34351398326.pdfIn PDF document text
    • https://s3.amazonaws.com/janodojivi/cognitive_distortions_worksheet_gcu.pdfIn PDF document text
    • https://4ceac43d-3374-4736-8926-b47930641487.filesusr.com/ugd/3b1191_5e1b541bc21b42bab59317babc6549a3.pdf?index=trueIn PDF document text
    • http://vujipopeb.rf.gd/47333457096.pdfIn PDF document text
    • https://s3.amazonaws.com/jeponowon/vcenter_6._7_update_2.pdfIn PDF document text
    • http://fusipabi.epizy.com/brain_teasers_books_free_download.pdfIn PDF document text
    • http://wepogevadapafa.atwebpages.com/20700462676.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_off0000f037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF037 5052 bytes
SHA-256: a0823ab4a06f66a103f5acf563b4d7021b6f467358dc950911381933bbffc43d
font_01_sfnt_off0001016d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016D 10916 bytes
SHA-256: c974fef375fb108e861104f6f3193fbd67605c7f15e2e05eb5cfc8255266d71f

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