Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbbbd45e441d7c82…

MALICIOUS

PDF

70.7 KB Created: 2020-11-11 15:46:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 31488e842c160b201cbb9d5a19f8fa21 SHA-1: 2057b6cbbc356df5931b35b93476701536ec0549 SHA-256: fbbbd45e441d7c82cdadd1fd56a21f1733fd452e3f661b8ac6d9ed67cee85e50
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9997

Heuristics 5

  • 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 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://traffking.ru/123?utm_term=what+does+zoning+r4+mean PDF link annotation
    • https://pepisukuwen.weebly.com/uploads/1/3/1/6/131606293/gazeduwape_xiwetuj.pdfIn PDF document text
    • https://fupexorugukemig.weebly.com/uploads/1/3/0/8/130814763/xovamelobasojison.pdfIn PDF document text
    • https://xebololu.weebly.com/uploads/1/3/4/3/134340913/bolokalalapusid.pdfIn PDF document text
    • https://junafoxotoroj.weebly.com/uploads/1/3/0/7/130738975/niwudexutisoboruro.pdfIn PDF document text
    • https://xodunutejoxefis.weebly.com/uploads/1/3/4/4/134476009/nijabe.pdfIn PDF document text
    • https://lewotivegil.weebly.com/uploads/1/3/4/3/134320996/1dba2d0bb578f48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368748/normal_5f9512e3784cc.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/9677ac23-4c82-44fc-9d87-cfcf82e9fd4c/10075548857.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fbea1f1-335b-437c-912f-8e95b8b02fe5/36438407553.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ee61cad-ffed-4fe4-97ef-fb4423e6f3d8/pukesafavumini.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c069247c-2652-453c-9664-b5625d9d0298/serodomilolemixatolanal.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_off0000d8ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AE 5356 bytes
SHA-256: 1661e2fdf48144b393e2c029238d5201d9fc53afa388055e6dcbf2cbb97e1446
font_01_sfnt_off0000ead7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD7 9948 bytes
SHA-256: 10ff9e7f625f0597cc0bc276cb79e8dfc8525d90406ef0462041477690369d7a

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