Malicious PDF — malware analysis report

Static analysis result for SHA-256 631499975bd81c1a…

MALICIOUS

PDF

78.3 KB Created: 2021-02-23 21:57:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: c30bb37a2eb107e6c8f1d3192d419e9b SHA-1: 77fb73663e7bd962ef6f3a6dce70cbc29af281e9 SHA-256: 631499975bd81c1a506b08ed6da239b368fc6859bf59fe0f992b4b14c90871a2
96 Risk Score

Malware Insights

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

The PDF contains an embedded URL that points to a suspicious domain, identified by heuristics as an external URI and flagged by ClamAV as a phishing trojan. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/strik?utm_term=what+is+breaking+news+in+spanish PDF link annotation
    • http://wegijezunulej.22web.org/axios_file_name.pdfIn PDF document text
    • http://lupamepo.22web.org/bacteroides_uniformis_cect_7771.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393188/normal_6011d0ae1ed43.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466173/normal_5fedf975d980a.pdfIn PDF document text
    • http://lemixop.iblogger.org/49439527197.pdfIn PDF document text
    • http://alexandreablog.com/zewolivogutogozosisia3m8.pdfIn PDF document text
    • http://characduwe.space/loud_bollywood_ringtones_2018ux7lh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463010/normal_5ff4ae4016f41.pdfIn PDF document text
    • http://lanuxariparola.iblogger.org/whirlpool_appliance_repair_melbourne_fl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500189/normal_5fd1584065ec3.pdfIn PDF document text
    • http://cmb-societe.com/9_wing_chun_dummy_training_techniques47jo3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jafujasiwetid/barogutodasulafaluxejeful.pdfIn PDF document text
    • http://lebevinawefebo.rf.gd/algorithm_book_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/tamobalasu/sandisk_mp3_player_bluetooth_pairing.pdfIn PDF document text
    • https://s3.amazonaws.com/sebunuzu/70304541068.pdfIn PDF document text
    • http://sonazorapabame.epizy.com/city_building_games_mod_apk.pdfIn PDF document text
    • http://zujitix.epizy.com/15026738293.pdfIn PDF document text
    • https://s3.amazonaws.com/faduxodiwo/g._f._a._m_full_form.pdfIn PDF document text
    • https://s3.amazonaws.com/fomudebipefasu/56913194480.pdfIn PDF document text
    • https://s3.amazonaws.com/toguvaju/naan_parthathile_remix_song_free.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f30a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30A 5356 bytes
SHA-256: 666cade5538448a188bf7f19f811eb8df51949803a0337aa83ec2acfe4797156
font_01_sfnt_off00010555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10555 11844 bytes
SHA-256: b0dd865b64f9aae9be9e12da42f83224c12bdf7c32639174cc1662445d74803c

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