Malicious PDF — malware analysis report

Static analysis result for SHA-256 21fcc24e2e1915da…

MALICIOUS

PDF

75.0 KB Created: 2021-06-13 15:48:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d723e4872d07be88d06ac0f49ffc6e4f SHA-1: e0dd6099d0e28bcde3560dd6f4aa1fb2a241b432 SHA-256: 21fcc24e2e1915da2263d50b31ebf2042ff2791b7b6a89f6fecfe3af9f31cdc5
96 Risk Score

Malware Insights

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

The file is a PDF document that contains a URL leading to a malicious domain, identified by ML classifiers and ClamAV. The document body, though heavily obfuscated, suggests a lure related to an album song, likely to trick users into visiting the malicious URL. No scripts were extracted, but the presence of an external URI points to a phishing or malware distribution attempt.

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://krisoc.ru/pbw?utm_term=sathiyama+sollura+album+song
    • https://cdn-cms.f-static.net/uploads/4374371/normal_6055b278f3d63.pdf
    • https://cdn-cms.f-static.net/uploads/4485704/normal_602c77e68bf3f.pdf
    • https://cdn-cms.f-static.net/uploads/4490542/normal_60432894e6db7.pdf
    • https://cdn-cms.f-static.net/uploads/4421468/normal_60badf64615b2.pdf
    • https://cdn-cms.f-static.net/uploads/4413578/normal_605e03c334e00.pdf
    • https://cdn-cms.f-static.net/uploads/4478688/normal_60c5b25315184.pdf
    • https://cdn-cms.f-static.net/uploads/4451545/normal_60b8940a77e1a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gebetedoke.pbworks.com/f/96373370888.pdf
    • http://busututesemo.pbworks.com/f/gta_san_andreas_windows_10_64_bit_download.pdf
    • http://sixuditar.pbworks.com/w/file/fetch/144559041/letujelagulusugopesipido.pdf
    • https://uploads.strikinglycdn.com/files/b177bbaa-6fbf-4eba-8deb-b2948a829cee/how_to_get_real_id_during_covid.pdf
    • https://uploads.strikinglycdn.com/files/daadbc32-1b13-4b3b-9097-9c4dae9e0b27/54900021167.pdf
    • https://uploads.strikinglycdn.com/files/0a1b4a2e-67fe-4a9f-8164-528853b4d0a5/bell_bike_computer_console_300_manual.pdf
    • https://uploads.strikinglycdn.com/files/43ee66b9-eee3-428d-b32e-44352a586280/funny_maths_puzzle_questions_with_answers.pdf
    • http://poxanoralanu.pbworks.com/w/file/fetch/144426225/dakifufabalanutudu.pdf
    • http://zusemivak.pbworks.com/f/67274383403.pdf
    • http://vugufosenene.pbworks.com/f/80738211477.pdf
    • http://feselikebapu.pbworks.com/w/file/fetch/144913884/boomerang_make_and_race_apk.pdf
    • http://banusiv.pbworks.com/w/file/fetch/144981942/26749476899.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_off0000e6ee.bin
05c3e94741439364678b26dd68c80b5bbb5605177a60409e507a05b40dec2633
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EE 5444 bytes
font_01_sfnt_off0000f94d.bin
848c6ffcf5d90dc0ad4be253966702f3d7b5fee103241d718c6230cd6e2a4aa6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF94D 11164 bytes