Malicious PDF — malware analysis report

Static analysis result for SHA-256 b551b680ffc1ef1c…

MALICIOUS

PDF

84.6 KB Created: 2021-02-16 01:14:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 9ce13af51e3e70cdd13863bbee3b10ed SHA-1: 05e8d0569abd057cd19e0315ae5985ad526415ab SHA-256: b551b680ffc1ef1c83ad9e0585002cfe7804ea1b9a35aab51c7d7ab79935d02e
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 specifically pointing to 'jacksth.ru' and a UTM parameter suggesting a targeted campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links on disposable hosting, further supporting a malicious intent. ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious nature. Although no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/123?utm_term=us+army+survival+gear PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4468270/normal_5ff0020fd6446.pdfIn PDF document text
    • http://load-bcp.com/dt_design_evaluation_sheetu2n5f.pdfIn PDF document text
    • http://nanolenka.xyz/zebenidesuret6d9n8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454051/normal_5fd31be2c68e9.pdfIn PDF document text
    • https://jaxemojemilela.weebly.com/uploads/1/3/4/6/134622921/gadadaworaxelog.pdfIn PDF document text
    • http://samyog.ru/51555321965bi80w.pdfIn PDF document text
    • http://trokot-shtorki.online/40792041942wl94c.pdfIn PDF document text
    • https://xiligori.weebly.com/uploads/1/3/1/4/131411896/0e575094601.pdfIn PDF document text
    • http://test123test.xyz/anyways_messenger_for_androidh8a7v.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450635/normal_5fe5a67b9291e.pdfIn PDF document text
    • https://biditeso.weebly.com/uploads/1/3/4/3/134339176/menimutubelo.pdfIn PDF document text
    • https://widosogepe.weebly.com/uploads/1/3/3/9/133986955/1ea3c9b99.pdfIn PDF document text
    • http://fisuruwibowin.66ghz.com/18450816964.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486351/normal_6014f5c26fbf9.pdfIn PDF document text
    • http://apple-fruit.space/32010995073l190p.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://runesufosufej.rf.gd/crafting_guide_mod_1._12.pdfIn PDF document text
    • http://fezobuvetole.rf.gd/78837646925.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF038 5160 bytes
SHA-256: b9a1b406ebd64bb722ce331128e1e2702323bac072e44f330f8accc439a732dc
font_01_sfnt_off000101bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BF 10856 bytes
SHA-256: a3a81922d3113cc407644e88966fd05b227b2d682e747aff478a83b6d4a19bcc
font_02_sfnt_off000126f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F2 18264 bytes
SHA-256: ee6bfd9f1c88bb53f910dcc84508cde818a64fb38421e82c6ae5cef28e96201c

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