Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf9aaa0699eea099…

MALICIOUS

PDF

82.7 KB Created: 2021-04-19 18:13:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8a3abfe67c86f42e4692502b420031fc SHA-1: 2215843956ec10611d2a914c48713701a02c3de1 SHA-256: cf9aaa0699eea099196cce0b455411075ac35b3c339e8de1b2ae299b2057e966
104 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The document body, though heavily truncated and obfuscated, contains text that suggests an urgency lure, such as 'account will be terminated' or 'action required within 24 hours'. The presence of multiple external URLs, including one that appears to be a phishing lure, indicates an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://jumiwimov.ru/strik?utm_term=is+buying+a+hot+tub+a+good+idea
    • http://kugewezebuvigiw.mygamesonline.org/logarithmic_learning_curve_analysis.pdf
    • https://cdn-cms.f-static.net/uploads/4466143/normal_5fd0a9d78fb65.pdf
    • http://pokemonrivals.online/what_is_an_sbir_grantg3ucn.pdf
    • https://static.s123-cdn-static.com/uploads/4383915/normal_5ff2263c29798.pdf
    • http://dodabefokibejo.22web.org/karovuxolati.pdf
    • https://cdn-cms.f-static.net/uploads/4366004/normal_606746c739201.pdf
    • http://cuzinfo.ru/66752154301x8yb5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://9a4b5e96-23fe-4021-9525-787506808755.filesusr.com/ugd/b3318b_efb838184cb24c3c918d91a10483d7a3.pdf?index=true
    • https://s3.amazonaws.com/vuzufexarevima/32645444934.pdf
    • http://ludakijawiku.rf.gd/81848693968.pdf
    • http://xudefeb.epizy.com/edital_do_banco_do_brasil_2020.pdf
    • https://044e8d80-c429-4a1f-820d-9b443c65b389.filesusr.com/ugd/53c654_8a13679863d24353ac799b45ac1ee95a.pdf?index=true
    • https://s3.amazonaws.com/pekatikisuruki/damurolebimosefobapogala.pdf
    • http://zisukuvi.atwebpages.com/traductor_espaol_ingles_audio_gratis.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8e5.bin
fb1f046c915e17ea1e6c1bb1e73bba27cf9bf63c79d0b928bcabafe83dae6bb3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E5 5020 bytes
font_01_sfnt_off000109e9.bin
9970a9a429825e3f2a90b03a32c13b4f15fb3b18bb4f1c8c398881cf5a278642
pdf-font-stream PDF embedded font (sfnt) at offset 0x109E9 11080 bytes
font_02_sfnt_off00012f9c.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F9C 4324 bytes