Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f52ee2ec1d32463…

MALICIOUS

PDF

76.6 KB Created: 2021-03-07 23:58:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: de5cef4b6bc0b52aad7c02277287dab6 SHA-1: 16dcaafd0ebf56fad9a8041411e9814cbf165bbc SHA-256: 7f52ee2ec1d32463cea347a4510b8e162679fb667f19877958dbe89e8770a7fd
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/wix?keyword=russia+and+the+republics+physical+map+quiz PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4423427/normal_5fe84de97b8d6.pdfIn PDF document text
    • https://terigemi.weebly.com/uploads/1/3/1/8/131856376/wukasarukabari-noxirilila-jatawira.pdfIn PDF document text
    • http://tafedudim.22web.org/best_template_for_facebook_business_page.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501961/normal_603a4dc01b176.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404725/normal_60237f81d1a45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463809/normal_60244494459b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376849/normal_5fda49582adf5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530578/normal_6021d1cae167f.pdfIn PDF document text
    • http://pojurolididamek.22web.org/32508133767.pdfIn PDF document text
    • https://dugaposiga.weebly.com/uploads/1/3/4/8/134857723/6267532.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/903214a9-63dd-4eb4-a5ec-48ff4409f2e1/zazuzeru.pdfIn PDF document text
    • http://tewisexomu.rf.gd/kinezinufom.pdfIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/rosipomizodurebefewoseb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b946b170-7b2f-478c-a9b5-3020c4aa49ff/59594731885.pdfIn PDF document text
    • http://wowibizuraval.rf.gd/nijopoporab.pdfIn PDF document text
    • https://s3.amazonaws.com/geraromu/guwogojonabenurawik.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_off0000d89f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89F 5736 bytes
SHA-256: 6a9aa4a31defaf4729eeebab02300ef2eca6d544ce9e65e51235e939dadc4fbf
font_01_sfnt_off0000ebfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFE 10280 bytes
SHA-256: a6c5998080ac28b8204b9714fa55cc3e8eeb5261cfc6ab584467fc931a607d0c
font_02_sfnt_off00010f75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F75 16388 bytes
SHA-256: 534e44c921e8acb9c8e993207df297c85ca6c672af4c6174c05b3ca24a170572

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