Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2613a0b31d738dd…

MALICIOUS

PDF

75.8 KB Created: 2021-03-18 07:44:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 382581bd4d073b5acd868daa4acb4b64 SHA-1: 1577debd4fa2a28cb01e0f13abe91647b20d20fa SHA-256: e2613a0b31d738ddd4a92ac03d167888a952892900dc8ad9557815880d296f03
96 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It contains an embedded URI pointing to a suspicious domain, vilenefex.ru, which is likely used to host a phishing page or a second-stage payload. The document body, though heavily obfuscated, suggests a lure related to educational worksheets.

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://vilenefex.ru/award?keyword=irregular+plural+nouns+worksheet+5th+grade+pdf
    • http://folejaf.mypressonline.com/36822190914.pdf
    • https://cdn-cms.f-static.net/uploads/4407996/normal_600e78b4167e6.pdf
    • http://zulupid.iblogger.org/english_to_korean_alphabet_chart.pdf
    • http://zozeviremi.iblogger.org/loxopabukagorafulofiz.pdf
    • http://nepoxiduvilej.scienceontheweb.net/gubovanabogifun.pdf
    • https://cdn-cms.f-static.net/uploads/4408992/normal_5fd1023e0edb1.pdf
    • http://bukobaxaz.getenjoyment.net/bivorunon.pdf
    • https://cdn-cms.f-static.net/uploads/4454821/normal_601e7be9d1654.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://dogiwexor.myartsonline.com/ruletave.pdf
    • https://uploads.strikinglycdn.com/files/e9097dca-e49b-42c8-bb71-763c5ee878bb/sorcerer_spells_5e_level_1.pdf
    • https://33c7e2ec-32fc-4676-a642-9d95a4379e01.filesusr.com/ugd/622218_c1ad8443d900464a84190f62d45d5ac9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8ae09e57-a432-4295-bc55-d02019ddb05f/45682247493.pdf
    • http://najexenij.onlinewebshop.net/bash_bunny_manual.pdf
    • https://24a70dd4-b549-4b9e-9c0a-6eea45ab85ad.filesusr.com/ugd/ab0c63_d2ab00c3bd7a41bb8d01ca8113fde4b6.pdf?index=true
    • http://duvodix.myartsonline.com/how_to_reset_the_control_lock_on_a_whirlpool_duet_dryer.pdf
    • http://lexamokoxerum.atwebpages.com/pavanenevukewadosebesopu.pdf
    • http://sakolizel.rf.gd/text_animation_template_premiere_pro_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc3d.bin
5c1f275f12d2386ea069e01b1fe007cae2e91acf5afe9bc200383aee5efd1f46
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3D 5356 bytes
font_01_sfnt_off0000ee7c.bin
21925d4e2bbfba2638fac4d3784f411eb02475bdeb34542dd98790d3b513ba8b
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7C 10960 bytes
font_02_sfnt_off000113cb.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0x113CB 4324 bytes