Malicious PDF — malware analysis report

Static analysis result for SHA-256 e160e84275531802…

MALICIOUS

PDF

74.9 KB Created: 2020-11-18 16:56:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 52ea6162a7187240ce8b838469d2c27a SHA-1: 160562cbe619cf91643000b47d3c09f30b06cf1d SHA-256: e160e842755318026fa9f62f55f5717452f136a79a92fe451e7c22458c10c303
186 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 0.9998

Heuristics 6

  • 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 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.
  • 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://traffine.ru/123?utm_term=step+11+worksheet PDF link annotation
    • https://gebulofafilo.weebly.com/uploads/1/3/4/7/134717894/478a6e8bd69f.pdfIn PDF document text
    • https://gadudomarun.weebly.com/uploads/1/3/4/7/134705140/9910026.pdfIn PDF document text
    • https://nitowapesapu.weebly.com/uploads/1/3/4/4/134442046/kamovunuv_mudazubegez.pdfIn PDF document text
    • https://gononazenikemad.weebly.com/uploads/1/3/4/4/134482012/sazapuwofeselin-mutube-wopojij-loriselegijezow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420019/normal_5f9b454cef1bf.pdfIn PDF document text
    • https://kelobutino.weebly.com/uploads/1/3/0/9/130969458/1385475.pdfIn PDF document text
    • https://wofuzokekaxan.weebly.com/uploads/1/3/4/4/134465278/2229362.pdfIn PDF document text
    • https://tazejoga.weebly.com/uploads/1/3/1/3/131383942/pogibatajote_rosirorotow.pdfIn PDF document text
    • https://duwobimisenuzo.weebly.com/uploads/1/3/4/6/134615726/buboguwidufi.pdfIn PDF document text
    • https://defifipak.weebly.com/uploads/1/3/4/4/134442047/redobivufatidu_xozomefos_likivekaro_nixokepixofu.pdfIn PDF document text
    • https://gidepezugubuwo.weebly.com/uploads/1/3/4/7/134766768/lotadi.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/bawalidamovidud/dagudomuseju.pdfIn PDF document text
    • https://s3.amazonaws.com/modowor/39394602766.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_off0000e909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE909 4976 bytes
SHA-256: 9e19efb50d599b8d5984c7610730132ce3e59ce594349e81f51f093f49f38a96
font_01_sfnt_off0000fa11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA11 10740 bytes
SHA-256: 6791070ebb2d02209fcc35312a84fb933e056ba9ad9809c962540382801f4ac6