Malicious PDF — malware analysis report

Static analysis result for SHA-256 a85a161401d829cd…

MALICIOUS

PDF

68.8 KB Created: 2020-12-02 16:45:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 98cf211d3708b4ceef7268e95b2c9bc2 SHA-1: ec72b93221f1d19f8648c1ea8fca170d9f05b6b0 SHA-256: a85a161401d829cd8848771ad2707df51cba283cb4c5b7768c45dfdb25707a99
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains a link that redirects to known malicious infrastructure, identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The ML classifier also flagged this PDF with a high probability of being malicious. The embedded URL is likely intended to lure users into downloading a secondary payload or visiting a phishing site, masquerading as a timesheet template.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://gettraff.ru/aws?utm_term=daily+billable+hours+timesheet+template In PDF document text
    • https://mebenemezozu.weebly.com/uploads/1/3/4/6/134689881/64d5a05c71f3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381320/normal_5f95edcf8d3aa.pdfIn PDF document text
    • https://xizodekez.weebly.com/uploads/1/3/4/7/134769153/577596d8819.pdfIn PDF document text
    • https://tulalezosisab.weebly.com/uploads/1/3/4/6/134601470/a8ff221e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/24c9bbf0-536c-4f19-a9e6-caed6ae1a3b9/raziluxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5b4e174-f7ef-4a3c-bf1e-7907c07ae9c4/colegium_cph_cja_cl.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0f0de5bcb0228a282afe8/t/5fc135ba173fb5383bce3da6/1606497722725/cos_to_sin_shift.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdfd2c9d7936484054a605/1606286639556/jajutaxamajubibexaroze.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e155104edf1d7780ac3e/t/5fc292463485235c861a8d44/1606586950643/famous_spanish_people_in_history.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_off0000cfda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFDA 5300 bytes
SHA-256: 2679437af15f9e9c686fe17ccb5c08b171f36617bc9e7af57c3e01110f2deaeb
font_01_sfnt_off0000e1b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B9 10812 bytes
SHA-256: 90df89ab088339433b2a456c916f66f4acaef051f5bfda41f6a85c3ced822ae3