Malicious PDF — malware analysis report

Static analysis result for SHA-256 e289e1029a6f9afd…

MALICIOUS

PDF

74.7 KB Created: 2021-03-26 07:21:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4c0cde201ba37b462685148daf19fca0 SHA-1: 73017dc23b33bd6939d922fb9b7bee0fea798a50 SHA-256: e289e1029a6f9afdfd1d737cce89faa92ef7c8fc5d954993e03abdd24c6132fc
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, indicating a high likelihood of malicious intent. The presence of an external URI pointing to 'dafemum.ru' suggests a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a spearphishing attachment designed to lead the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/123?utm_term=multiplying+integers+worksheet+pdf
    • http://unreguezff.rest/dizobefqb5e.pdf
    • https://static.s123-cdn-static.com/uploads/4421333/normal_6005e01fa57b9.pdf
    • https://cdn-cms.f-static.net/uploads/4375515/normal_60279fd8a6223.pdf
    • https://patufefuwo.weebly.com/uploads/1/3/4/3/134312622/nuxeladuregukipewodu.pdf
    • https://talegojozafadi.weebly.com/uploads/1/3/2/3/132303005/liradenatovadenen.pdf
    • http://myfoxing.online/81925000997eyg77.pdf
    • http://dwatches.site/handel_minuet_in_g_minor_hwv_434_pianop3jnw.pdf
    • https://wozizagozesa.weebly.com/uploads/1/3/4/8/134848764/gebeletotopi.pdf
    • https://cdn-cms.f-static.net/uploads/4418993/normal_60504892ad4e0.pdf
    • https://cdn-cms.f-static.net/uploads/4388271/normal_5fda9192a534d.pdf
    • https://dasufurejer.weebly.com/uploads/1/3/0/9/130969026/9114076.pdf
    • https://setopotuvojinow.weebly.com/uploads/1/3/4/8/134877086/edd767243d24.pdf
    • https://zupavuzinopaz.weebly.com/uploads/1/3/4/2/134265708/vasaxewezup.pdf
    • http://oyuncuxx.com/how_to_open_a_jammed_supra_lockboxh0bnc.pdf
    • http://badgesverified.com/85272640310w8chc.pdf
    • http://antonioita.fun/nibabedodedogobakulubukut6mtlq.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/medaliwifufugel/firilo.pdf
    • https://s3.amazonaws.com/tibanepoxilibud/let_it_go_video_with_lyrics.pdf
    • https://s3.amazonaws.com/rodakarugupoko/old_school_music_70s_and_80s.pdf
    • https://s3.amazonaws.com/vapite/safe_haven_baby_box_hammond_indiana.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_off0000e1c1.bin
7c767b3c0facb6a687958fdbe15a192bc2fa81a33a8a7c319e6743db8c4e8c0a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C1 5356 bytes
font_01_sfnt_off0000f41b.bin
74f9ba50122a1e4940959dcd8c5deea6cf71f4b8235e521de676b1aa1b0a987f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF41B 11700 bytes