Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcba612ba45d6eb7…

MALICIOUS

PDF

83.8 KB Created: 2021-04-14 00:45:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a7563c5a9c1ab58249bf0bf91b4a982a SHA-1: c9c506c4234fbaf300e14f343b8f2d3e522f6ad6 SHA-256: dcba612ba45d6eb73ce27dc41064c8bcc59aac98ff57e2f6301b83d1d391cee3
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent URL pointing to a domain associated with phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple disposable hosting domains and link farm characteristics further supports a malicious phishing or malware delivery scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://lozipotod.ru/strik?utm_term=how+to+write+a+proposal+powerpoint+presentation PDF link annotation
    • http://fexavakagejil.iblogger.org/31390362346.pdfIn PDF document text
    • https://saguwaxofules.weebly.com/uploads/1/3/2/6/132681351/957c3a4d74c8be1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373768/normal_602f2c1cd8c73.pdfIn PDF document text
    • https://tafujopebipa.weebly.com/uploads/1/3/0/7/130774972/nafudebeb-lulomugegeno-kowuve.pdfIn PDF document text
    • http://pumeputokamodo.22web.org/meditations_marcus_aurelius_hays.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475379/normal_6024090b3dbfe.pdfIn PDF document text
    • http://nasodojazawito.iblogger.org/light_field_microscopy.pdfIn PDF document text
    • https://lefokanu.weebly.com/uploads/1/3/4/3/134377273/tiwoxupisuxemefono.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496810/normal_6033a14a69e95.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471690/normal_5fe94d2e95dc2.pdfIn PDF document text
    • https://sapilijufidukuw.weebly.com/uploads/1/3/4/9/134901451/kozotepulirifofode.pdfIn PDF document text
    • http://rarubife.mygamesonline.org/appsc_previous_papers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zipoxibel.epizy.com/thomas_calculus_book_11th_edition.pdfIn PDF document text
    • http://pukafenofi.epizy.com/nwea_lockdown_browser_for_mac.pdfIn PDF document text
    • http://fuxurekosorozu.rf.gd/spanish_books_for_beginners_free.pdfIn PDF document text
    • http://mevonaku.rf.gd/novawofisenimolufoti.pdfIn PDF document text
    • http://dofovomomame.epizy.com/lexuguwoge.pdfIn PDF document text
    • http://xafamikipu.epizy.com/57610261440.pdfIn PDF document text
    • http://gofanukeguwul.epizy.com/17530337822.pdfIn PDF document text
    • http://xemunebo.atwebpages.com/92613780806.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_off00010a95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A95 4868 bytes
SHA-256: f2d726be362e6ab57b6c972c22281cffb17166111a1ef6fae484cd660d0a0216
font_01_sfnt_off00011b39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B39 11356 bytes
SHA-256: 7213618111d83728a2783abb05053771e16b420f6a3d94520aef474e54ce13f4

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