Malicious PDF — malware analysis report

Static analysis result for SHA-256 e92209870e16bd6f…

MALICIOUS

PDF

85.1 KB Created: 2021-03-24 06:12:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd94c37eddd69feb94e884a88adbee38 SHA-1: 800646d76c15b07c716452ad13d23fbb5cdbceb2 SHA-256: e92209870e16bd6ff7bf61c38566a586c3cdb96f29b9e1900174e274415f51a5
156 Risk Score

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 SEO-optimized and point to other PDFs, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URLs and the document body's deceptive title point towards a lure for downloading potentially harmful files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/wix?keyword=the+polar+express+book+pdf+download+free
    • https://letotanuvimipe.weebly.com/uploads/1/3/4/5/134598603/wevutubutefizoxog.pdf
    • https://wejobufobugof.weebly.com/uploads/1/3/5/3/135348322/fajavu.pdf
    • https://cdn-cms.f-static.net/uploads/4408343/normal_601dca466f8b8.pdf
    • https://nejavedejelije.weebly.com/uploads/1/3/4/3/134336697/9736529.pdf
    • https://cdn-cms.f-static.net/uploads/4384645/normal_6043fc342fc3d.pdf
    • https://sodapovi.weebly.com/uploads/1/3/4/4/134494820/197ee75e006.pdf
    • https://kikafizujugu.weebly.com/uploads/1/3/4/0/134012642/buwatasa.pdf
    • https://tavutapakewig.weebly.com/uploads/1/3/5/3/135399939/meruvag.pdf
    • http://gitodejigo.iblogger.org/apprendre_le_russe_alphabet.pdf
    • http://gogotaf.iblogger.org/pdf_text_editor_free_windows.pdf
    • https://komimarokobak.weebly.com/uploads/1/3/4/6/134604519/kagesif_mezulomojinop_xozusa_xewabuw.pdf
    • http://pisodanijuke.iblogger.org/uob_information_classification_and_protection_standards.pdf
    • https://kovipokuvukos.weebly.com/uploads/1/3/4/4/134497495/2334bfca0a43126.pdf
    • https://danupinizagene.weebly.com/uploads/1/3/1/4/131483344/fudomarulerom_rumol_ziluvewunutew_wegup.pdf
    • https://cdn-cms.f-static.net/uploads/4387226/normal_60139163a4d11.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://f6ea5e03-7e7c-4dce-82ee-fd5d223759ef.filesusr.com/ugd/d203ad_3bfe4ce9aba74d5b848e60415d700391.pdf?index=true
    • https://s3.amazonaws.com/vibasujefir/rikaxokosak.pdf
    • https://4123e755-5e7e-4fb8-b167-49ba90d37259.filesusr.com/ugd/fd3290_088b18d2018b40b397f24a39c4112f86.pdf?index=true
    • https://s3.amazonaws.com/vuxalirudidel/2010_lexus_rx_350_oil_filter_wrench_size.pdf
    • http://zamutuxagen.epizy.com/epson_wp_4530_ink.pdf
    • https://75ca6b5e-a470-4e0e-8004-b00a9f1721b4.filesusr.com/ugd/1e4819_eedcaefdfe784097a6fe496ee532caf1.pdf?index=true
    • https://s3.amazonaws.com/dozore/woxogetusirezo.pdf
    • http://vivirimivu.epizy.com/how_much_steel_does_canada_export_to_the_us.pdf
    • https://s3.amazonaws.com/tifuwuw/avid_s6_manual.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d8f.bin
b40d7c6aad5df1d27f25d5caeb13204c5e6d9e4279703cb711d4ea252094bc07		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8F 5444 bytes
font_01_sfnt_off00012018.bin
dba4847d74d3e482a864124360e85f5eb8c53f76a9d50ace2378ecd8728eb064		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12018 11240 bytes

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