Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6f3c01cf15aa03a…

MALICIOUS

PDF

78.3 KB Created: 2021-03-30 09:44:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: bbdec4a0fc0dd4650dbe54f5fbee16ee SHA-1: e526332d5279aa6cc260c74e8772d9d1c5358e4e SHA-256: a6f3c01cf15aa03a6a09cd0ab4aef04b9b1e3f6d86419823552ac1742938068f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as an external URI pointing to a suspicious domain ('soxebez.ru'). Heuristics indicate the PDF is a link farm on disposable hosting, and ML classifiers and ClamAV strongly flag it as malicious, likely phishing-related. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a malicious 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://soxebez.ru/award?keyword=amazon+sales+rank+chart+2020+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451970/normal_602f5f7f2e441.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444353/normal_604756b13a54d.pdfIn PDF document text
    • http://noliwotobomog.22web.org/car_airbag_system.pdfIn PDF document text
    • http://rekijiwowak.scienceontheweb.net/nitexufik.pdfIn PDF document text
    • http://pesuloduf.medianewsonline.com/vexijitirugilirovi.pdfIn PDF document text
    • http://naropiwazufilu.22web.org/decimal_on_a_number_line_worksheet.pdfIn PDF document text
    • http://govusinixarimi.iblogger.org/92928592238.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485435/normal_60400d6b328f3.pdfIn PDF document text
    • http://witikotuxigere.scienceontheweb.net/50013115529.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lifoluzosuzatus.rf.gd/74348948702.pdfIn PDF document text
    • http://merojupamen.epizy.com/lego_batman_3_game_guide.pdfIn PDF document text
    • http://nazonuretowu.epizy.com/konebima.pdfIn PDF document text
    • http://rawotagetanona.rf.gd/amazing_spider_man_comics.pdfIn PDF document text
    • https://s3.amazonaws.com/fasomusogapovi/go_math_grade_7_practice_book.pdfIn PDF document text
    • http://xobusifuj.epizy.com/kibeja.pdfIn PDF document text
    • http://jizanisan.epizy.com/equivalent_fractions_worksheet_grade_5.pdfIn PDF document text
    • https://s3.amazonaws.com/galinikagopit/99285044170.pdfIn PDF document text
    • https://2a1457bb-a4d2-449b-8914-d784a503a6da.filesusr.com/ugd/c0fca2_fd2e0426f9a34b14affe0be4495ff8bf.pdf?index=trueIn PDF document text
    • https://8eefcaf3-52f5-4123-8be5-b1f0aaeea45e.filesusr.com/ugd/1d3654_3e44e7080a9d4c96a97fa4a6af8a47ef.pdf?index=trueIn PDF document text
    • https://2a009ac4-5770-49f2-ae16-4ce107243443.filesusr.com/ugd/59deca_a32bc5c03b654376ad7e3293266ec46d.pdf?index=trueIn PDF document text
    • http://xubobesirubujo.rf.gd/wilibumewomunofurinux.pdfIn PDF document text
    • https://6eed613e-cbae-405e-b458-9655ef9033f8.filesusr.com/ugd/e4f6f0_1948b4fa38444d539a2c67beff694635.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B4 5772 bytes
SHA-256: 5948495e15adb3c8154309ad350059f2b6ddbbc9d604274e65ace4c0dc27bd2f
font_01_sfnt_off00010837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10837 10440 bytes
SHA-256: 8faf01079128ea18af92a87493f455e67f04740575b96e696d5b97cd32ca8446

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