Malicious PDF — malware analysis report

Static analysis result for SHA-256 82935268970213d5…

MALICIOUS

PDF

73.0 KB Created: 2021-01-10 16:16:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 1872f18ab8a18d2a55427bbb6a4ce740 SHA-1: 0dcca8edd19ed6475ce48562386822b51a019312 SHA-256: 82935268970213d50efaff12c023b9439db4fa1181fdc31eaafc534ceeb29706
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 0.9997

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://trafftec.ru/wb?keyword=nbc%20sports%20tv%20schedule%20tour%20de%20france PDF link annotation
    • https://site-1176294.mozfiles.com/files/1176294/do_simple_to_do_list_widget.pdfIn PDF document text
    • https://site-1233197.mozfiles.com/files/1233197/rugedagak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489429/normal_5fa932e1b1722.pdfIn PDF document text
    • https://mofazutozu.weebly.com/uploads/1/3/4/8/134871383/xexopifofa.pdfIn PDF document text
    • https://dosedupuwosiwoz.weebly.com/uploads/1/3/0/7/130776272/ea520c57f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415308/normal_5fadca8abe860.pdfIn PDF document text
    • https://site-1173833.mozfiles.com/files/1173833/like_a_boss_gift_set.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366034/normal_5f874d85ad505.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369508/normal_5f8de04891168.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425238/normal_5fa226bc33cb3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451561/normal_5fd08d6924138.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403407/normal_5fae06567045f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443824/normal_5fa53434bddbb.pdfIn PDF document text
    • https://site-1172011.mozfiles.com/files/1172011/mutulaxomadovogirusakote.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE031 5412 bytes
SHA-256: cec660a59a4d7e1e774eaf91330bb57e993a6705e91aa7ff965fcde09ee760cf
font_01_sfnt_off0000f29c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29C 10752 bytes
SHA-256: d9ed884fc482ce3486eef4607f32887c91bfa8479040a3b42fa1e5690bf46715

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