Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2947143a026e67b…

MALICIOUS

PDF

66.4 KB Created: 2020-11-17 17:03:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 77e40f519dadcb7c077987226795dc13 SHA-1: 92d79d154d13f0b1964be9e4695c62783a6be89c SHA-256: c2947143a026e67bb1278a0bc558e9297a5691c0dedb19899740ef091ea6e309
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 0.9997

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://traffnew.ru/123?utm_term=the+alcohol+experiment+login PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412382/normal_5f9d82cb0f064.pdfIn PDF document text
    • https://valakafugajebe.weebly.com/uploads/1/3/4/3/134330742/2570015.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368228/normal_5f93668c8ecd2.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/37adad4d-8d46-468d-abc0-3b17f69a41e9/45615685392.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2331a1e8-ca01-4562-9176-3cb68a4f05bd/older_download_mp3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff84e4b4-ceff-4430-a3ff-889c550465bb/faropizutanekuleso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c87a03c9-3d2f-48be-bcc1-40266bd646b2/95995170111.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58b3d4d3-33c4-4152-9488-31814925f08a/evaluacion_cuantitativa_y_cualitativa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75b84a74-703f-4434-afb4-3706b5fa11b6/xarofemiduzoti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebd58ba5-9b09-4040-810a-5b2137090a45/ritasikem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83fe2913-fb4c-4d6d-b855-07442e757a51/religion_of_massachusetts_bay_colony.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c08e495-e507-4475-8cc9-b1ba194c6e5e/ximemerivafomuzi.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_off0000b3c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C2 5184 bytes
SHA-256: fa7dc77108fbcb538cc83372d9d94c1dc10e568ff184ace78408b4e839245162
font_01_sfnt_off0000c544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC544 9960 bytes
SHA-256: 9d058a62e1b7b496623b2df8b1a6a1891f0fa3c9c4cb19d41e8354c08fe4de17
font_02_sfnt_off0000e78c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78C 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501

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