Malicious PDF — malware analysis report

Static analysis result for SHA-256 158cf8212ad62942…

MALICIOUS

PDF

73.4 KB Created: 2020-12-25 14:41:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: cf35fe8c0fdad6f0e9a70d30f6e9de9c SHA-1: 93ffb79cb27581abb912836839051cf81d0bf906 SHA-256: 158cf8212ad629426bfb153520d0efbe0cc69eebd9668b71735ae9f64aff403e
96 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains an embedded URL pointing to a suspicious domain, which is likely used to deliver a secondary payload or redirect the user to a phishing site. The document body, though heavily obfuscated, suggests a lure related to technical topics, consistent with phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 4

  • 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://trafftec.ru/strik?utm_term=linear+regression+formula+example PDF link annotation
    • https://sigogaxeba.weebly.com/uploads/1/3/4/6/134620414/xodarosewe_tibopikaxoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456999/normal_5fb9cc1660562.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389797/normal_5f93ced1489ff.pdfIn PDF document text
    • https://zujamabosav.weebly.com/uploads/1/3/4/3/134363941/vemurejetavetunimen.pdfIn PDF document text
    • https://guvoladedesu.weebly.com/uploads/1/3/1/4/131453897/723a85d3.pdfIn PDF document text
    • https://noparageselex.weebly.com/uploads/1/3/1/8/131856757/30f07106.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/552e73ee-77a3-467e-a324-a24cb4b1cd56/mr_yang_calculus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44e40703-71f7-4b04-98bf-b7b7dd09e24a/fildo_apk_latest_version_2018_download.pdfIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/77695167591.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6331f335-7623-4890-bfce-87bdd51e7392/29195439851.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d64e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64E 2960 bytes
SHA-256: a31aedb3fe800cd2b5c0120397ec9570e12c7cc97febb81e3d6171160c50e6bc
font_01_sfnt_off0000e0d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D0 5228 bytes
SHA-256: f0f97336a8ed032ecffaa0190cc75d4fbe31f58febab06d2ef37463cd1c5935e
font_02_sfnt_off0000f298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF298 11280 bytes
SHA-256: b9b993470b790d82ec26ad4f73b5a47a46f766c9dffe5f2c4ff9b629cf52e2a0