Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dbc03bebe0a4f04…

MALICIOUS

PDF

74.3 KB Created: 2021-06-13 14:10:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 35158d8b42fd6894723c14c18b72448c SHA-1: 51af43f06f11a142f3e8c59535f236bbe2a9bf95 SHA-256: 0dbc03bebe0a4f04bf2b7a8a90b8b99d421f4ea34c45fbb694e9c9bf035c9560
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting services, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://midufefew.ru/123?utm_term=stay+rihanna+piano+accompaniment+sheet+music PDF link annotation
    • https://tevupiju.weebly.com/uploads/1/3/4/8/134865653/zudabafu-bekilofepakazu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448341/normal_6022bac5d0cd7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373778/normal_60c445567e10a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455174/normal_5fdef0a3951f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496381/normal_6053068c1be94.pdfIn PDF document text
    • https://kiwotatuna.weebly.com/uploads/1/3/1/8/131856308/74fb7741.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472481/normal_603fa4fb8fcd2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451565/normal_605de20a8d248.pdfIn PDF document text
    • https://zefodikibaxamot.weebly.com/uploads/1/3/0/8/130814254/pekosi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374848/normal_60621c1e5da2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487382/normal_60bd48aa2c1c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365525/normal_6025c5f0b1d89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416510/normal_60bd53c5aa028.pdfIn PDF document text
    • https://jeputuzomum.weebly.com/uploads/1/3/1/3/131398597/454785.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367311/normal_604b782a36bdd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mukibilevejo.pbworks.com/w/file/fetch/144472695/how_to_make_bead_work.pdfIn PDF document text
    • http://ziriwuru.pbworks.com/f/90028558684.pdfIn PDF document text
    • http://lakebimutep.pbworks.com/w/file/fetch/144415959/download_after_1.pdfIn PDF document text
    • http://jeveriwilum.pbworks.com/w/file/fetch/144599202/what_are_good_things_to_do_during_quarantine.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_off0000e32c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32C 5348 bytes
SHA-256: ef536ad403aa424292eb4e86459e723e34eb72dc15529974dc232c73c7841823
font_01_sfnt_off0000f534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF534 12048 bytes
SHA-256: 9a913031a3ca3a3d837ceae53d19a0cf7e1d2717937027e5b67eeb71f9836f34

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