Malicious PDF — malware analysis report

Static analysis result for SHA-256 36f86373ddc19a2f…

MALICIOUS

PDF

89.3 KB Created: 2020-11-18 08:02:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 750d2b8f830957da8a5a10eb591c6d09 SHA-1: 169e64a917e9ed4dd0ca5446c040102042969df5 SHA-256: 36f86373ddc19a2faafe11aa2e8ac556009a394c5dc24fa7e56be0cca7eba8a5
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffe.ru/aws?utm_term=ballerina+full+movie++in+tamil PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403684/normal_5fa7007d89196.pdfIn PDF document text
    • https://zirenujunez.weebly.com/uploads/1/3/4/4/134431605/fijozujedate.pdfIn PDF document text
    • https://pozanabuloga.weebly.com/uploads/1/3/4/3/134366917/finevotiboze.pdfIn PDF document text
    • https://folemazilepi.weebly.com/uploads/1/3/1/1/131164248/daganuke-mewodubelufib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413967/normal_5fa626dff16d4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/levovod/58700617950.pdfIn PDF document text
    • https://s3.amazonaws.com/batiku/58371291423.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/zuvuvikugomobolo.pdfIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/77347997028.pdfIn PDF document text
    • https://s3.amazonaws.com/kumasala/ralegawevubekubomobopebip.pdfIn PDF document text
    • https://s3.amazonaws.com/xatojem/vekurunizepulomanow.pdfIn PDF document text
    • https://s3.amazonaws.com/zemigiduwagafu/brihaspati_vrat_aarti.pdfIn PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/bocconi_test_ammissione.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_off0001218d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1218D 4844 bytes
SHA-256: 09b491fc7cd5387f65d97c905e71d79964a02172493fd306f911662c1c321956
font_01_sfnt_off000131fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131FA 11448 bytes
SHA-256: 303f1fb01f0020fdbdc09340c4c4e20a79f0e6f4ecaa2b13bb1ae502ed42ab63