Malicious PDF — malware analysis report

Static analysis result for SHA-256 c91e5c19aaa0d539…

MALICIOUS

PDF

99.2 KB Created: 2021-03-14 06:09:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a9faf68ee0ed49a4c188ad11ed7dd8c8 SHA-1: 442516c8c38b0e4e1515809f122bfdb25d695435 SHA-256: c91e5c19aaa0d539011f912b195eeac695426d39821abe77b06ff20935379ec9
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a critical detection score. It contains an embedded URI pointing to a suspicious domain, likely intended to trick the user into visiting a phishing or malware distribution site. The document body is heavily obfuscated, but the presence of external URIs and the overall detection suggest a phishing or credential harvesting attempt.

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://druttle.ru/award?keyword=que+es+el+arsenico+pdf
    • https://cdn-cms.f-static.net/uploads/4460723/normal_60223e5630360.pdf
    • http://gelivebun.22web.org/76129015707.pdf
    • https://static.s123-cdn-static.com/uploads/4387050/normal_5fecee426b3d9.pdf
    • https://static.s123-cdn-static.com/uploads/4369304/normal_5fc588c1d882b.pdf
    • https://cdn-cms.f-static.net/uploads/4479942/normal_5fd64c7201261.pdf
    • https://cdn-cms.f-static.net/uploads/4367308/normal_5fd924a0d247a.pdf
    • https://static.s123-cdn-static.com/uploads/4380522/normal_5fdfb7d49216f.pdf
    • https://cdn-cms.f-static.net/uploads/4450889/normal_604134b4e33b0.pdf
    • https://cdn-cms.f-static.net/uploads/4459337/normal_60199cd589e40.pdf
    • https://cdn-cms.f-static.net/uploads/4488842/normal_603ff50c4d1b9.pdf
    • http://mobutadaxez.medianewsonline.com/31506299671.pdf
    • https://static.s123-cdn-static.com/uploads/4449768/normal_6000be7a18050.pdf
    • http://lulopoboxefon.scienceontheweb.net/76202910157.pdf
    • https://static.s123-cdn-static.com/uploads/4427519/normal_5fdd0c25750a3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://rusuxipek.rf.gd/reading_comprehension_worksheets_for_grade_5_cbse.pdf
    • http://bujepuzetotoj.rf.gd/sinupurepugikifowuju.pdf
    • http://piwuzodoxomox.epizy.com/elementary_english_grammar_test_questions_answers.pdf
    • http://vujuvisesakok.myartsonline.com/lajuviduvanumakoxez.pdf
    • http://palomidifigur.epizy.com/flow_sheet_diagram_of_contact_process.pdf
    • http://tikokowekujuw.epizy.com/bichagadu_movie_telugu_video_songs.pdf
    • http://kugefosames.rf.gd/76419371205.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_off00013aad.bin
eafdbe381e654d9ebf0c93d7c9f25ecdc26a854bec36deb7cd8a207a80e7f1f9
pdf-font-stream PDF embedded font (sfnt) at offset 0x13AAD 5212 bytes
font_01_sfnt_off00014c76.bin
32c27c81bf02e76637ca544cacbd2c71abde036e786473e9acc9e2c2f5537be4
pdf-font-stream PDF embedded font (sfnt) at offset 0x14C76 15524 bytes