Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4af8f6a7337370c…

MALICIOUS

PDF

71.7 KB Created: 2021-01-31 16:49:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: a1b80504b371cb55e10925cd0c33cfef SHA-1: 2d591541e476027fb3ca7c666693929a7181c121 SHA-256: d4af8f6a7337370c5817949bb5e50fdc1fc144492b0af0688b02fd85bb9aee24
96 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains multiple embedded URLs, one of which is presented as a "data structures and algorithms pdf" to deceive the user into downloading a payload. The presence of external URIs and the ML classification strongly suggest a malicious intent to deliver further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/123?utm_term=data+structures+and+algorithms+pdf PDF link annotation
    • http://liketsven.xyz/ejercicios_de_alcanos_ramificados_pdtfzy1.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwonumatag/idSmhj5/97283799966.pdfIn PDF document text
    • https://cdn.sqhk.co/jasowipe/rchhHca/spin_tales_mod_apk_1._9._3.pdfIn PDF document text
    • https://cdn.sqhk.co/megilujij/diighhd/sikoturusuxafoxagoxin.pdfIn PDF document text
    • https://cdn.sqhk.co/sepokafaru/hgeQVvx/12544182694.pdfIn PDF document text
    • https://cdn.sqhk.co/lojosewude/2Ww05ra/pufijazilesatu.pdfIn PDF document text
    • https://cdn.sqhk.co/rejiwosujupa/uhdQgd4/65844339278.pdfIn PDF document text
    • http://poroda.site/tasobivibajiz3378p.pdfIn PDF document text
    • http://varnisvakq.ru/11437177053369hv.pdfIn PDF document text
    • https://cdn.sqhk.co/wajuletixex/DPgftKr/call_of_mini_brawlers_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/rivitovolu/gjhaChe/81653157655.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://zimemotom.rf.gd/33631748705.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_off0000ceab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEAB 5452 bytes
SHA-256: ee041229426f322e2bb6e01eaab902e334db0ac8d7c6fe8616692af62dcc31a8
font_01_sfnt_off0000e109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE109 10248 bytes
SHA-256: a3be801055a3495db5c688ffb8611aacacb0d429fac6963fd0c8848fd3e65443
font_02_sfnt_off00010401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10401 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3