Malicious PDF — malware analysis report

Static analysis result for SHA-256 51d24c2e3f4124f0…

MALICIOUS

PDF

69.4 KB Created: 2021-04-04 13:28:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: ca38e46faa34d60380df92da9a32b168 SHA-1: b0690be0f8df2a73f0925b612e3c016e7ac89faf SHA-256: 51d24c2e3f4124f01b9bb39c7d2790dc839d99fc62d196178c40ee8da908d684
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 of which are generated SEO-style links, indicating a link farm designed to direct users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a phishing or redirection attack.

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://druttle.ru/wix?keyword=duke+convection+oven+manual PDF link annotation
    • https://cdn.sqhk.co/petawelesup/ijjjjif/gamakepesezibozojabenun.pdfIn PDF document text
    • https://cdn.sqhk.co/gederanew/icnjiiB/rock_band_hero_xbox_one.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454543/normal_600a1cdc96093.pdfIn PDF document text
    • http://fapokopo.22web.org/nemowarovun.pdfIn PDF document text
    • http://wokulorumal.iblogger.org/amsterdam_city_map_download.pdfIn PDF document text
    • https://cdn.sqhk.co/jumupebuvi/feFqjbA/oral_history_definition_geography.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446646/normal_5fca849ef34e7.pdfIn PDF document text
    • http://tubujek.iblogger.org/2303156831.pdfIn PDF document text
    • http://wemigime.iblogger.org/adventurers_wanted_slathbog_s_gold.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c33c3ce4-fa2f-4f19-9477-7a801b41b29e.filesusr.com/ugd/ebbcbd_cc67eada37e24b57b84359ca482fb13a.pdf?index=trueIn PDF document text
    • http://wimovokixopipi.rf.gd/booting_process_in_linux_step_by_step.pdfIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/80960809356.pdfIn PDF document text
    • https://s3.amazonaws.com/takebemanijewok/bazaar_full_movie_in_720p_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/budovewesekaz/theme_of_poem_anthem_for_doomed_youth.pdfIn PDF document text
    • http://bajamixowi.epizy.com/organic_chemistry_principles_and_mechanisms_2nd_edition_solution_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/sivanira/intercontinental_hotel_financial_report.pdfIn PDF document text
    • http://katujomun.rf.gd/49966609017.pdfIn PDF document text
    • https://5902ff30-e651-486c-ac37-3e8383bfa78f.filesusr.com/ugd/f35da0_9363648ba3f34f63949f59b2028336d7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xijuxosisomuna/suwatavifogamewarutowezu.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD411 4796 bytes
SHA-256: d2bf4b4672c4385af83ad7f36f10cbf87afaec60f2deae402ea9c4db667d097a
font_01_sfnt_off0000e462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE462 10576 bytes
SHA-256: c73f42a477546398eb868952e4e9e69cd6bc7eddb13d8f46a79efc4bf51e943a

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