Malicious PDF — malware analysis report

Static analysis result for SHA-256 d67a4104e75b0928…

MALICIOUS

PDF

69.1 KB Created: 2020-11-24 05:45:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc2755dbfedc4e8d4112050aeacc7bfa SHA-1: 75c8ed0e5ebd21e6f27d8fd83fd99649fee1cac9 SHA-256: d67a4104e75b0928900e7af80cddb44710944a0537a6b9aebafd655f6206108b
104 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'traffine.ru/strik', which is likely a malicious domain used to host or redirect to a secondary payload. The presence of a 'download button' heuristic further suggests a social engineering lure to trick the user into downloading malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffine.ru/strik?utm_term=inequality+word+problems+worksheet+9
    • https://cdn-cms.f-static.net/uploads/4385634/normal_5f9384386b706.pdf
    • https://cdn-cms.f-static.net/uploads/4366407/normal_5f8b81b64c536.pdf
    • https://cdn-cms.f-static.net/uploads/4371808/normal_5f894a0b53952.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dabatisew/wizebit.pdf
    • https://uploads.strikinglycdn.com/files/52955a88-210f-4a8f-9e6c-817b3f60ad1d/sources_de_lumires_colores_1s_exer.pdf
    • https://uploads.strikinglycdn.com/files/b556e7f5-2d20-46be-8a6d-182b62de1ede/death_by_scrabble.pdf
    • https://uploads.strikinglycdn.com/files/a8cbd38d-f8e3-425f-b356-d9d9eef484bd/sasefofuk.pdf
    • https://uploads.strikinglycdn.com/files/6e98e18f-0f42-4c33-a313-fa07812a9c83/variloropijopebasiz.pdf
    • https://uploads.strikinglycdn.com/files/d20708e7-df91-4719-b5bf-aabd72621867/vofilotifomupewobaranab.pdf
    • https://s3.amazonaws.com/mujesogi/bpsc_full_form_in_eb.pdf
    • https://uploads.strikinglycdn.com/files/7f2c751d-3463-410a-9a84-67e65f152c52/veromajexedonalaxalagebej.pdf
    • https://uploads.strikinglycdn.com/files/fd1fda5f-24fd-48e4-bdad-6e43a43d6946/foliku.pdf
    • https://uploads.strikinglycdn.com/files/df2a5f60-c46a-4dfd-a0e1-655a50124c6e/23528883204.pdf
    • 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_off0000cc1d.bin
95aa4b0d57b520256adf199a22eb15ceeba88439db0199f49b4e4d30d440f705
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC1D 5816 bytes
font_01_sfnt_off0000dfc9.bin
b777d2438bf57ba01e15c8ae049974eb4fd9445556cbd1d8d9987505300f0989
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC9 11844 bytes