Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8330840a50a6014…

MALICIOUS

PDF

75.5 KB Created: 2020-12-27 06:40:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: be3cb4e2366e56b3d10fbd77c10b0d49 SHA-1: eb4ea081acf03425a04f9cecc85a7f08007cd9d6 SHA-256: b8330840a50a601414f4f34d408b94dcda9e7d2bfdcc2019d1ab3a4201d83db1
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to S3 buckets and other hosting services, suggesting a link farm or redirection mechanism. The primary URL, 'https://traffset.ru/123?utm_term=flutterbye+fairy+charging+instructions', indicates a lure related to 'Flutterbye fairy charging instructions' to direct users to a potentially malicious site. ClamAV and ML classifiers also flagged this PDF as malicious, supporting the phishing or scam pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/123?utm_term=flutterbye+fairy+charging+instructions PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4427785/normal_5fa26d8e6885e.pdfIn PDF document text
    • https://mavuvuze.weebly.com/uploads/1/3/4/6/134688820/nupapefexefewo_mofelofozubomug_mesolifex_wedewik.pdfIn PDF document text
    • https://kusebedanosude.weebly.com/uploads/1/3/1/1/131163667/5670049.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416935/normal_5faede4a9241b.pdfIn PDF document text
    • https://budaxopam.weebly.com/uploads/1/3/4/7/134711784/pesurexibo-vagovosevaxured.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zakunafu/zudipeguk.pdfIn PDF document text
    • https://s3.amazonaws.com/makumapikeze/comcast_email_not_updating_on_android.pdfIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/minions_movie_720p_in_tamil.pdfIn PDF document text
    • https://s3.amazonaws.com/jakujakula/gibbets_bow_master_mod_apk_unlimited_money.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f486880e-5e08-40f0-a1d5-b4a80feb8eb0/jaxuwomuvizefeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cc29814-892f-4177-b05c-15f2f611efee/don_t_you_cray.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/filmywap_2019_bollywood_movies_housefull_4.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_off0000d4fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FC 5340 bytes
SHA-256: bdb24f91d5b2541d09a6d8c6996e94204688f94c5aa7e5cdee79b4103cc9c3c5
font_01_sfnt_off0000e72c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72C 10660 bytes
SHA-256: 79fde08ced514432818c3e0b8decd685c726eae6c6469656d6aa3d1126fb865b
font_02_sfnt_off00010c0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0F 16088 bytes
SHA-256: 1264a556fabc14c69ec4ba4609a347bffa09942e523f09f2774283a283413be9

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