Malicious PDF — malware analysis report

Static analysis result for SHA-256 7024d35e2c3146a0…

MALICIOUS

PDF

76.7 KB Created: 2021-03-14 02:46:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d35f4c5f7783b8f05007eacaf0956e71 SHA-1: 5b55c7279b4ad065321ec18d7ad17937d3bbd5b5 SHA-256: 7024d35e2c3146a0cc973722c0526876e845a050cdf2fdb910205a6d75b7a9b0
134 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. It uses an urgency-based lure. 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 0.9999

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://jacksth.ru/123?utm_term=coroners+reports+wales PDF link annotation
    • http://bilkaita.space/14530252966abo1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373271/normal_600dcbdb93568.pdfIn PDF document text
    • http://intereriia.com/90292166659erwwn.pdfIn PDF document text
    • http://starkrobotics.org/pobavawobuvaxomoso8pv4k.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486033/normal_60046e46d7b13.pdfIn PDF document text
    • https://cdn.sqhk.co/gidufulelav/aaGhivn/acellus_login_teacher.pdfIn PDF document text
    • https://cdn.sqhk.co/dijabidasu/ja1ghvD/crewmate_hunt_checklist_app_for_among_us_game.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vexabimumemig.atwebpages.com/redarorewukebiwozasuzopo.pdfIn PDF document text
    • https://8a7e94d2-1b07-4399-8a7b-cfebf1eb419e.filesusr.com/ugd/e78b77_a25d75fbfa67458ab7c129c803e9d0a8.pdf?index=trueIn PDF document text
    • https://025b4bf0-2906-4f5f-8a0f-6d4b68fc9518.filesusr.com/ugd/148ee2_5d40410d2fa34123a6da8b870251997e.pdf?index=trueIn PDF document text
    • https://4b0cdf75-2e42-4830-99f1-bbdbaec3f661.filesusr.com/ugd/891219_a6308886259d43a18d87d86bebd2aaf8.pdf?index=trueIn PDF document text
    • http://nebojemesiwi.atwebpages.com/seeds_of_yesterday_book.pdfIn PDF document text
    • https://d17f4099-ecc1-42b1-9c73-51521793457c.filesusr.com/ugd/4a2613_927dd6ef05c442efbc71e7980a13d7c0.pdf?index=trueIn PDF document text
    • https://76bf42c0-7447-45ed-8dd3-33f9786ae3ae.filesusr.com/ugd/ba2c19_bb3c3f8711ee411ba45252071052e004.pdf?index=trueIn PDF document text
    • https://33b7cf8b-1cb2-46d9-9063-17e97cba5e80.filesusr.com/ugd/9edd50_07a96389f7b44881b21dccbdd0c1d3c7.pdf?index=trueIn PDF document text
    • https://8a833fea-7c9a-4d2e-a5a7-d3590f42a3e5.filesusr.com/ugd/9aab09_653e617bbae241658af337cbceca9b93.pdf?index=trueIn PDF document text
    • https://69868269-04aa-4a0d-8379-1371762fd556.filesusr.com/ugd/d8beff_57730f7eebd040f8ba65eaa6bd4e018c.pdf?index=trueIn PDF document text
    • https://013c3ecd-17dd-4738-ad87-554153c764a5.filesusr.com/ugd/36f25b_a27255e064434c7aaea34a59aad5b3e7.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_off0000ee2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2A 4808 bytes
SHA-256: 216444fbc84e98b400e1923825f731806bcc0d2dbd50d0d5bb3749c69b248b74
font_01_sfnt_off0000fea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA0 11156 bytes
SHA-256: 173f7755e9a8b96c42ef43c0797791a526d0e3dec00c19ac9f74d79efa66ae79

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