Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8de53dcfa28dc43…

MALICIOUS

PDF

100.4 KB Created: 2021-03-20 19:58:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5271f793b99f6f7bdc2b6dba49d36382 SHA-1: 5663f16988fafe10afeed919e7c1d1667c908b7a SHA-256: a8de53dcfa28dc436e48b97f9d94493da102917242ca25e6b7ca9be0b6480a8d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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, suggesting it functions as a link farm or phishing lure. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly indicate that the primary function is to redirect users to potentially harmful external websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://maypoin.ru/award?keyword=alice+in+wonderland+2020+script+pdf
    • https://cdn-cms.f-static.net/uploads/4419832/normal_6047eb9e31838.pdf
    • http://fibutogu.mywebcommunity.org/what_are_the_physical_requirements_to_be_an_army_ranger.pdf
    • http://lirinevewafa.mypressonline.com/59815815921.pdf
    • https://bilukejax.weebly.com/uploads/1/3/5/3/135392742/732e3.pdf
    • http://hookup681.site/192288140793bn70.pdf
    • http://timelessdecorum.com/how_does_cognitive_behavioral_therapy_help_insomniaqa0rx.pdf
    • http://xozonline.ru/digatedosokozafepac0kww.pdf
    • http://levitajagukog.scienceontheweb.net/pisivuvopodoteguxajusuze.pdf
    • https://gikejujeg.weebly.com/uploads/1/3/5/9/135966421/4508726.pdf
    • https://poxapoxidofex.weebly.com/uploads/1/3/4/0/134016688/gojerimuzopapojixu.pdf
    • http://manamuposa.getenjoyment.net/2003_honda_civic_hybrid_repair_manual.pdf
    • https://sidedelozamuk.weebly.com/uploads/1/3/1/4/131482822/3414024.pdf
    • https://wurilulisewanid.weebly.com/uploads/1/3/4/7/134728532/2406076.pdf
    • https://kafasomawupi.weebly.com/uploads/1/3/0/7/130775431/gasutijoz.pdf
    • https://tigibivimibi.weebly.com/uploads/1/3/4/3/134344299/mavufuxapadazuw.pdf
    • https://munelexogetajax.weebly.com/uploads/1/3/1/4/131437313/ace62068.pdf
    • https://mufajagirudul.weebly.com/uploads/1/3/1/4/131452858/ponodixemunexoja.pdf
    • https://static.s123-cdn-static.com/uploads/4368951/normal_60001fb2e745f.pdf
    • https://govabegos.weebly.com/uploads/1/3/4/0/134018252/gelana-wiligekugov-mudodere-wifalun.pdf
    • https://cdn-cms.f-static.net/uploads/4487399/normal_6023d25b0c371.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014002.bin
c736ef36066e7b70e6acad06b97897f02ffeca21f32b813306273b083fdb2b1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14002 5292 bytes
font_01_sfnt_off00015208.bin
5b7ba4fa2733b256a7c98e8bddeb2628f05e955ec707349906fc8957729281a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15208 10564 bytes
font_02_sfnt_off000175db.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x175DB 4324 bytes

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