Malicious PDF — malware analysis report

Static analysis result for SHA-256 57d071f8a228856b…

MALICIOUS

PDF

78.0 KB Created: 2021-04-23 20:13:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 72f71edb6ec01bd2d71340998875fe28 SHA-1: 70c2c2e8c49aaba8eaaf5a57264dcadeabd7a51c SHA-256: 57d071f8a228856bd5b7d5b68823314dc6b88f59bef80bd592b5879d687ba9d6
186 Risk Score

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 0.9993

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://xajibur.ru/strik?utm_term=is+linux+mint+good+for+beginners PDF link annotation
    • http://fbcopyright-center.com/skinny_body_care_lawsuit455bs.pdfIn PDF document text
    • https://cdn.sqhk.co/xezafube/Sjhjegh/61992903665.pdfIn PDF document text
    • https://bosewumakujo.weebly.com/uploads/1/3/6/0/136036310/d47878f.pdfIn PDF document text
    • https://sapefesoj.weebly.com/uploads/1/3/1/4/131453354/d04b1d001.pdfIn PDF document text
    • https://cdn.sqhk.co/jelasusoved/gcOnhjL/unscramble_word_itches.pdfIn PDF document text
    • https://panonalosisewe.weebly.com/uploads/1/3/5/3/135316392/2205291.pdfIn PDF document text
    • https://cdn.sqhk.co/giwitosak/hfihOSP/easy_baby_cross_stitch_patterns_free_printable.pdfIn PDF document text
    • https://cdn.sqhk.co/kuretunaba/rhhYje3/professional_photographer_using_cheap_camera.pdfIn PDF document text
    • http://myyshooop224.site/10395633625pjaq.pdfIn PDF document text
    • http://micrometerdigital.xyz/goxepabikebuzadukazasu87gsm.pdfIn PDF document text
    • http://wanezizexakidiz.22web.org/letogogej.pdfIn PDF document text
    • https://xunopigiwigon.weebly.com/uploads/1/3/1/6/131636761/41c1a.pdfIn PDF document text
    • https://cdn.sqhk.co/minofavazu/easdhdK/34689863492.pdfIn PDF document text
    • https://cdn.sqhk.co/veludewozen/jfWjcqr/asgardians_of_the_galaxy_movie.pdfIn PDF document text
    • https://cdn.sqhk.co/tosobulig/Tgibhhe/okay_madam_full_movie_watch_online.pdfIn PDF document text
    • https://cdn.sqhk.co/tofegejij/eWEnjc1/poguse.pdfIn PDF document text
    • https://nodudoweg.weebly.com/uploads/1/3/4/5/134599631/nojurotexebamuzekur.pdfIn PDF document text
    • http://jufilosod.iblogger.org/90s_dance_house_music_playlist.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mudozegiviw.epizy.com/dave_ramsey_career_book_recommendations.pdfIn PDF document text
    • http://suxanovovogemi.rf.gd/gidufidalut.pdfIn PDF document text
    • http://fanavefekur.rf.gd/jejajojiguku.pdfIn PDF document text
    • https://eeff404e-5492-4914-a1d7-e39d1f35e6b2.filesusr.com/ugd/e58d70_c15794ddfcf54c359690685726632722.pdf?index=trueIn PDF document text
    • https://c8070bf9-ed42-4c5d-8eb8-ca35ee70f136.filesusr.com/ugd/d38238_1aff6381557746438164728910cf4832.pdf?index=trueIn 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_off0000f4ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CE 5160 bytes
SHA-256: 3466a1f42fa1b43500184363f116b065af1c1e77197d83d36e277085c7b5c2d9
font_01_sfnt_off0001064c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064C 10584 bytes
SHA-256: 1570fdccc730f90cba477da930ec5bf9cbf3bab71ee2cc1683726168dbb648c9