Malicious PDF — malware analysis report

Static analysis result for SHA-256 4be4c1e73b48cd24…

MALICIOUS

PDF

82.2 KB Created: 2021-03-14 04:22:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d013151b3a2b07b41cc5762aacaf8fe1 SHA-1: 52ff3e7496a9c8329352ef54026bb978282ad8a4 SHA-256: 4be4c1e73b48cd24ab3b9f08d793628e908dad83db2d9b3ab62d38aed294a5fa
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://jumiwimov.ru/wix?keyword=gcse+biology+classification+worksheet PDF link annotation
    • https://cdn.sqhk.co/mojupesonon/ewhcigY/vanofasolodapizidof.pdfIn PDF document text
    • https://cdn.sqhk.co/birujusigog/WhcS0je/backtrack_for_windows_8._1.pdfIn PDF document text
    • https://cdn.sqhk.co/fagaxirupunu/PXjegjc/43562949620.pdfIn PDF document text
    • https://nasaperexi.weebly.com/uploads/1/3/5/3/135351481/5cda8.pdfIn PDF document text
    • https://zanegesolejax.weebly.com/uploads/1/3/5/3/135308051/kemelewaroji_lefanobujizuxu_zadadegu_rovojiv.pdfIn PDF document text
    • http://sodamasagu.66ghz.com/zebimog.pdfIn PDF document text
    • https://cdn.sqhk.co/susopavazane/dagija9/nozoluvogimadenosu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://08c3cc13-1ce0-4add-927e-a3aed263473e.filesusr.com/ugd/ccf397_a3121202543441348894f93bd09005a3.pdf?index=trueIn PDF document text
    • https://711a90e7-97f2-4eab-8690-3003ec1e9b64.filesusr.com/ugd/a0905b_a90cded859a2429a97dc795f3f81ac01.pdf?index=trueIn PDF document text
    • http://ginisanekuxowo.epizy.com/todafezaxapudixewada.pdfIn PDF document text
    • http://zafurug.epizy.com/dunesafivevigiw.pdfIn PDF document text
    • https://f4dd034e-00c7-465c-b850-fb2d75accad5.filesusr.com/ugd/769f78_2b2cff7adba4472a8b24d2307ece2653.pdf?index=trueIn PDF document text
    • http://zawopomosegasax.rf.gd/xigajalasoluxubeg.pdfIn PDF document text
    • https://0f926834-650c-4d5a-b53c-ad60ae412ccc.filesusr.com/ugd/6a44d8_ea422939a46e4a3e9245e8fbd86d2fa7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c2c637e-a21d-4133-9bca-51c11e04329b/duparubupazopajomo.pdfIn PDF document text
    • http://likitaponuviv.rf.gd/hp_probook_4530s_i5-2430m_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5f6b1b6-c37a-4002-897f-95795a72b494/fikabodovijikelomudi.pdfIn PDF document text
    • https://caf0f927-206f-4b4e-aa34-0dd3da53679b.filesusr.com/ugd/83d902_315d290263144f339816aa873b068e19.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
    • 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_off0000eb73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB73 5572 bytes
SHA-256: 780833fc0327d11b021ce5bdae05e92a3f8c753546d7d95709c0a1b9da3aaa1e
font_01_sfnt_off0000fe81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE81 11072 bytes
SHA-256: d2a2de2942ada1be4ea5ee833e6312f81c796dd75815386c4e3c3c5edd54612c
font_02_sfnt_off00012456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12456 16088 bytes
SHA-256: b2ddecaff7e2361bf51021b35f9c014659943b600c4f466cb4656cea9e83b80e

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