Malicious PDF — malware analysis report

Static analysis result for SHA-256 53a143aa4bee9a92…

MALICIOUS

PDF

72.0 KB Created: 2020-11-24 15:11:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 88c8154f674012102b0f2d5f35451ad2 SHA-1: 5e65b8b2be537967d37607667d0e827166a1c592 SHA-256: 53a143aa4bee9a92ec31dceb17fd08f2da17ac29158ffc4655063819e1d47ed2
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a common tactic for link farms and phishing campaigns. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafficel.ru/123?utm_term=amor+de+madre+novela
    • https://pewukuma.weebly.com/uploads/1/3/4/7/134762228/3046057.pdf
    • https://cdn-cms.f-static.net/uploads/4384045/normal_5f9b6c9323d00.pdf
    • https://pusigodumutujor.weebly.com/uploads/1/3/4/6/134610993/kuwurovulop-pojedavinipe-losir-vokilurawa.pdf
    • https://gumebasa.weebly.com/uploads/1/3/4/5/134509515/0151a5.pdf
    • https://butebipibib.weebly.com/uploads/1/3/4/2/134265815/3cc1ffe.pdf
    • https://cdn-cms.f-static.net/uploads/4451561/normal_5fb9ea09d0669.pdf
    • https://ligotilup.weebly.com/uploads/1/3/4/3/134313371/ffdc9786707cf.pdf
    • https://jatogogiv.weebly.com/uploads/1/3/4/4/134437993/e02587a617.pdf
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/sazuzakifazabivomoje.pdf
    • https://vagapirub.weebly.com/uploads/1/3/4/6/134648019/3f68145d5bd89.pdf
    • https://cdn-cms.f-static.net/uploads/4415080/normal_5f9d153425944.pdf
    • https://legopojuze.weebly.com/uploads/1/3/4/3/134369078/muwuniboliwodi.pdf
    • https://cdn-cms.f-static.net/uploads/4388407/normal_5fb444a52b39f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000dd93.bin
8b3655fef2cbeb4a1fc5974f2859de7828eedad955961033ed07fabaab88d354
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD93 4844 bytes
font_01_sfnt_off0000edf3.bin
34ff9e812468325e381de1fd9d9c069070ee7ebf3d1a8c5d1c96e6acb78a12e0
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF3 11192 bytes