Malicious PDF — malware analysis report

Static analysis result for SHA-256 f71fc418f925afd7…

MALICIOUS

PDF

70.0 KB Created: 2020-11-23 12:49:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: c085ca34d946f8908550d56779a907f1 SHA-1: 1172f287556ae0f215f0bad2373a14a5602a3447 SHA-256: f71fc418f925afd7fcc28734ae2ec95f569c42a4f419d94bfa480fce52b91a2f
156 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 0.9995

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 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.
  • 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://traffset.ru/strik?utm_term=simple+past+verb+to+be+exercises+pdf PDF link annotation
    • https://kutisujazuj.weebly.com/uploads/1/3/4/6/134625744/2600802.pdfIn PDF document text
    • https://robonodibogiva.weebly.com/uploads/1/3/4/6/134630072/3843228.pdfIn PDF document text
    • https://zujafewisanepo.weebly.com/uploads/1/3/4/3/134322282/1173620.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379851/normal_5f9045c4441e5.pdfIn PDF document text
    • https://pimipile.weebly.com/uploads/1/3/4/8/134883166/jidelagu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408483/normal_5fa8841d92e03.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/91ea45ca-a18c-44cb-84ce-40a939fe9b6a/godzilla_2012_hd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a0ec1db-eaa3-422a-8d5c-0e3f4572e237/trev_max_min_problemleri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37973be1-7a7d-4933-b281-0f359899238f/all_characters_langrisser_mobile.pdfIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/web_development_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbf27fc5-f846-4f4d-85c3-b066d4708bfc/gakuzuvesukedepuxikokitir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3968849d-e565-46bf-bd29-0435b6253341/86938485991.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB278 5352 bytes
SHA-256: 957ef29435ee60762de28c78caa5481fccdc78bb384164b39e62533ed5b35328
font_01_sfnt_off0000c4a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4A6 10164 bytes
SHA-256: 75025b6167192df57679aed44e5287b7ce77c7f96d062a75ab0d232e195941c5
font_02_sfnt_off0000e72a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72A 16344 bytes
SHA-256: f71dc48f6aec72b972a982a6b6c6240fce147d9096cd09a686c88abf2029d0ef
font_03_sfnt_off0000fcef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEF 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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