Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e621ae9ac2d9cc2…

MALICIOUS

PDF

81.3 KB Created: 2021-02-27 23:23:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb51df2a3d14b2589049de7590343f23 SHA-1: 1cbe2d160fb851ae52c61c65ffc31b6067c235fa SHA-256: 8e621ae9ac2d9cc2fa5628a50b3fed3240d84644300431d140c3833d27206b90
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The document body, though partially corrupted, appears to be a lure related to 'classification of real numbers exercises' to direct users to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://jumiwimov.ru/aws?utm_term=clasificaci%25C3%25B3n+de+n%25C3%25BAmeros+reales+ejercicios
    • https://xetuvamabur.weebly.com/uploads/1/3/1/4/131409037/117458.pdf
    • https://moxujudafetofa.weebly.com/uploads/1/3/2/7/132712376/8c2d4471b7a.pdf
    • https://jitikefovanoz.weebly.com/uploads/1/3/3/9/133997517/pikebasavuxefibol.pdf
    • https://lefizedut.weebly.com/uploads/1/3/2/6/132681647/8101454.pdf
    • https://lakerevuko.weebly.com/uploads/1/3/4/6/134654656/ladipuraxasimo.pdf
    • https://megewesaj.weebly.com/uploads/1/3/0/7/130738707/5722060.pdf
    • https://gozivuwedigati.weebly.com/uploads/1/3/4/6/134612943/f49f7bb.pdf
    • http://women-ita.space/19654437807n7bb0.pdf
    • https://wojedebaroz.weebly.com/uploads/1/3/1/6/131637691/03cfa3bd99d.pdf
    • https://sefositudixe.weebly.com/uploads/1/3/4/5/134524400/a55a2e452.pdf
    • https://bipagaposelugi.weebly.com/uploads/1/3/4/4/134479594/rurosike.pdf
    • https://menolalosixoj.weebly.com/uploads/1/3/4/7/134714047/6057ea7396e52.pdf
    • https://bepevefobe.weebly.com/uploads/1/3/4/6/134699504/f43e728c4402f9.pdf
    • http://9gusevshop.website/biafra_civil_warcpwbm.pdf
    • https://xupubiwe.weebly.com/uploads/1/3/4/3/134339906/vebudaxu-razafilikig-netevo-fanix.pdf
    • https://bikonate.weebly.com/uploads/1/3/4/7/134715396/5592043.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pokorevalaxex/maryland_circuit_court_answer_to_complaint.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db28.bin
eedb582d2b07cfa220b40be5b222e1c50cf3fd65b6732ea465cc409ff5a2a288		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB28 2060 bytes
font_01_sfnt_off0000e4c1.bin
9db8e506c1b51ac6927c5bcc8773a96f129f8f6c8b308cd150ae4c96d3ef2d5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C1 5400 bytes
font_02_sfnt_off0000f68b.bin
2507342511865a5bba5dde0b39937148b47b41da36a1f074f9c08e8a3106f5b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF68B 12644 bytes
font_03_sfnt_off00011fbb.bin
f7282090e270060608fdc575ded0b184a97243f724fc845514d2e81390c10c7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FBB 16144 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.