Malicious PDF — malware analysis report

Static analysis result for SHA-256 1445dbca1a2d39c6…

MALICIOUS

PDF

71.0 KB Created: 2021-05-21 11:46:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e2ecf7a76a28b90e12855691abc56746 SHA-1: 73805fdf18af9fb488541492ddb08ede4832ae85 SHA-256: 1445dbca1a2d39c6a69395e4cfa35c77411d5c51a397237a3a73305fe19721c4
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URL pointing to a suspicious domain, identified as malicious by ClamAV and a machine learning classifier. The document body, though heavily obfuscated, suggests a lure related to 'calligraphy learning books pdf'. The presence of an external URI heuristic further supports the malicious intent of directing users to a potentially harmful website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/strik?utm_term=calligraphy+learning+books+pdf
    • https://cdn-cms.f-static.net/uploads/4503987/normal_60498bd987251.pdf
    • https://cdn-cms.f-static.net/uploads/4413570/normal_600c72b508530.pdf
    • https://naxufagu.weebly.com/uploads/1/3/4/7/134713872/wutebanunijolukibetu.pdf
    • https://cdn-cms.f-static.net/uploads/4502178/normal_601b8d0bf2bcf.pdf
    • https://napufifibadabe.weebly.com/uploads/1/3/1/4/131406817/3333379.pdf
    • https://cdn-cms.f-static.net/uploads/4377113/normal_6066012b517ca.pdf
    • https://cdn-cms.f-static.net/uploads/4369191/normal_6023041a34230.pdf
    • https://puxokobipo.weebly.com/uploads/1/3/4/5/134524361/739774.pdf
    • https://cdn-cms.f-static.net/uploads/4371809/normal_5fdb3d670edde.pdf
    • https://fikejibin.weebly.com/uploads/1/3/4/3/134331262/9814717.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b45648cb-0d7a-484d-b80b-70da7f52af03/jasixe.pdf
    • https://s3.amazonaws.com/kobivimelelo/aceable_chapter_11_answers.pdf
    • https://s3.amazonaws.com/wujapu/ielts_academic_reading_practice_test_2.pdf
    • https://s3.amazonaws.com/panalipolifod/86284086419.pdf
    • https://s3.amazonaws.com/niporofez/lafegolego.pdf
    • https://s3.amazonaws.com/figugipopar/8_hp_briggs_and_stratton_engine_manual.pdf
    • https://uploads.strikinglycdn.com/files/47d61f82-1693-4834-b9ea-7bff6524af98/how_do_you_fix_the_auger_on_a_pellet_stove.pdf
    • https://s3.amazonaws.com/gofiguj/74146425455.pdf
    • https://s3.amazonaws.com/safago/80111837743.pdf
    • https://uploads.strikinglycdn.com/files/76adb25d-2fb2-438b-99dd-3220099d4b32/89968121854.pdf
    • https://uploads.strikinglycdn.com/files/77e2dcec-63ef-4998-a312-76cd9778192e/legit_online_jobs_make_real_money_from_home_today.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_off0000d9c6.bin
9bd83fa3ba1e1368404114fb87ecdd6359573269cf6ae86f433d7846f32b1e0b
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C6 5512 bytes
font_01_sfnt_off0000ec78.bin
35ea536cb1dac71a7dee74d530f4c2ea823ee6153e1f54a24baef8446a011142
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC78 9864 bytes