Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bef723f4b1d7378…

MALICIOUS

PDF

79.1 KB Created: 2021-03-18 04:53:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: df67eacf042cbd2e34d297e1ac9b5b00 SHA-1: bfdb124741a74965557e4458e7c99e66f17cd515 SHA-256: 3bef723f4b1d7378d6728a9a492ae6cf0be186a6129ac392026aea604a1d68a1
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, vilenefex.ru, which is likely used to host a phishing page or download further malicious content. The document body, though heavily obfuscated, suggests a lure related to 'Musical theatre analysis worksheet'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://vilenefex.ru/wix?keyword=musical+theatre+analysis+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4410204/normal_60430ed804535.pdfIn PDF document text
    • https://cdn.sqhk.co/fajoliteve/dkhgeT6/joruzoxa.pdfIn PDF document text
    • https://cdn.sqhk.co/vizefejij/SUhdNic/cardboard_box_cat_house_ideas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408582/normal_5ff893ff75b7a.pdfIn PDF document text
    • https://cdn.sqhk.co/gokarunedod/hdHibCf/90887838932.pdfIn PDF document text
    • https://cdn.sqhk.co/makafabakuna/S59jcjh/love_story_stickers_wastickerapps_apk.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/mipeboro/fiwukamigopebazatukek.pdfIn PDF document text
    • https://s3.amazonaws.com/tesotiwapax/enemy_pie_story_characters.pdfIn PDF document text
    • http://fibilizovowudux.epizy.com/48235645217.pdfIn PDF document text
    • http://repuvamiperubo.epizy.com/guvimudatodulakuloximovo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37045f61-43b5-428d-bb74-9453a65d4a07/lirr_huntington_to_penn_station.pdfIn PDF document text
    • http://zikoliduxa.atwebpages.com/vugojarisonuvivusi.pdfIn PDF document text
    • http://redanewirejawub.epizy.com/sociologie_l1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3ac7328-ecb8-4080-b01f-5ee1f15e4a17/41825486191.pdfIn PDF document text
    • http://xojogaregukuged.rf.gd/amaravathi_kathalu_in_telugu.pdfIn PDF document text
    • https://s3.amazonaws.com/xisakazelelinim/puxotag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e10bee3-bafc-4415-90c9-3cdbd696740d/dancing_at_lughnasa_plot_synopsis.pdfIn PDF document text
    • http://medazupu.onlinewebshop.net/21436234530.pdfIn PDF document text
    • http://wutejaxevewef.myartsonline.com/in_what_order_should_you_read_narnia.pdfIn PDF document text
    • http://nakeviw.myartsonline.com/febiwi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1917837-9c9e-40b9-837c-bb22528dca6c/43597282595.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4cade86-3bef-4a66-ba71-d8cb76c3e5d6/zirepatogubipowejabega.pdfIn PDF document text
    • http://nosigegu.onlinewebshop.net/how_to_reset_voicemail_on_mitel_5312_ip_phone.pdfIn PDF document text
    • http://vanakodezifezuv.epizy.com/97902552514.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F9 5148 bytes
SHA-256: 0cf899296ed9bce36429ee563460c3af31c6189b0cff3341f5a9b86ced8062f4
font_01_sfnt_off0000f398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF398 10968 bytes
SHA-256: 14364e40bf27686f701f83dbf78edaf51468eebdbbb97e1eca623ae7d937e316
font_02_sfnt_off00011943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11943 16140 bytes
SHA-256: 2732c78df68b4531e26da51a256f0f9ab881cb8a96d1886ade34872d88eeece3