Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bf13eaa6e055f15…

MALICIOUS

PDF

79.8 KB Created: 2020-12-29 12:08:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 3560944cbbabe4e3a9f487fe3e651d2e SHA-1: bf6464b02b838f99014f84effcaabbff3690ad4c SHA-256: 6bf13eaa6e055f158522b50d7d24efc3f76c10b45396b13284fc4651ae9d471d
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by a machine learning classifier and ClamAV, specifically flagged as a phishing trojan. The presence of a 'download button' heuristic and an external URI pointing to a suspicious domain further supports a phishing or malware distribution attack pattern. The document body, though heavily obfuscated, contains references that align with the detected threat.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/strik?utm_term=sims+mobile+sur+pc PDF link annotation
    • https://cdn.sqhk.co/jekefebiba/hFjghgd/vimejarelu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368229/normal_5f923c72a3e6f.pdfIn PDF document text
    • https://cdn.sqhk.co/nukuzulu/4GHLqgi/segib.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488339/normal_5fc892a4c771d.pdfIn PDF document text
    • https://cdn.sqhk.co/fudixaxogub/ffmdhdu/turaxudapomuxepawuzufupi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452173/normal_5faedcbdd608b.pdfIn PDF document text
    • https://cdn.sqhk.co/boxokozofe/9KhcaRD/xamexavofub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366018/normal_5fb2fe4d19ad7.pdfIn PDF document text
    • https://cdn.sqhk.co/weteroliwo/ig4hbgh/ritusaduvidaral.pdfIn PDF document text
    • https://cdn.sqhk.co/papusabefo/Jhi6ggD/31905868840.pdfIn PDF document text
    • https://cdn.sqhk.co/boketumejipa/gd8jbha/mifaduguzajozokorunuja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489035/normal_5fb383ceb41b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455907/normal_5fd67f91d2546.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467612/normal_5fc27e1feb738.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426263/normal_5fc6533a55672.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn 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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d96c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96C 5112 bytes
SHA-256: 5bc8c8c757974ebcc54b79575b9b6e65dabc67af4d20c3b70c17240376d12fdb
font_01_sfnt_off0000eaab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAB 1800 bytes
SHA-256: daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
font_02_sfnt_off0000f32e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32E 8916 bytes
SHA-256: bdbe30971c5db5fb679a3bcb29b4c967d071ced13d88323e41220a2baa59836c
font_03_sfnt_off00010c11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C11 11384 bytes
SHA-256: 89b1215b31748da2fb66c2683d8b4c1f36aaeba48581d62ebe52f6b265974a77

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