Malicious PDF — malware analysis report

Static analysis result for SHA-256 81fe1a982e86d562…

MALICIOUS

PDF

76.9 KB Created: 2021-06-03 12:52:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 266af442a9983d883eb44953f27c1732 SHA-1: 09befe29b4c75e122e721e45439a25abe52bee6f SHA-256: 81fe1a982e86d5620e636a4504eec31400e2983b3899ae66c70dc4793c0caf97
96 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains an embedded URI pointing to a suspicious domain, which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to a 'Logo game answers pack'. No scripts were extracted, but the presence of external URIs and the overall detection profile indicate a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=logo+game+answers+pack+23
    • https://static.s123-cdn-static-d.com/uploads/4474456/normal_60b69cc554e69.pdf
    • https://static.s123-cdn-static.com/uploads/4414152/normal_5fc5e9d4937b7.pdf
    • https://cdn-cms.f-static.net/uploads/4472774/normal_600a90d48f6ef.pdf
    • https://cdn-cms.f-static.net/uploads/4493221/normal_60500f4a3de5e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2b1fc941-7d52-4194-bb9c-44e43f64175d/jotifodafewulukit.pdf
    • http://molitutolu.pbworks.com/f/84464656766.pdf
    • http://nugewil.pbworks.com/f/nfl_football_games_tonight_on_tv.pdf
    • http://xetuduju.pbworks.com/f/zavipadunot.pdf
    • http://kolasotosexu.pbworks.com/w/file/fetch/144414648/biruponozemagikoz.pdf
    • http://xoxafepapesu.pbworks.com/w/file/fetch/144419382/82311874710.pdf
    • https://uploads.strikinglycdn.com/files/b63d3a3c-9d86-45c4-af11-32044bdc4579/315596434.pdf
    • http://mogulobobis.pbworks.com/w/file/fetch/144495627/resumen_de_cada_capitulo_del_libro_romeo_y_julieta.pdf
    • https://uploads.strikinglycdn.com/files/d09bfbc8-ac1a-4b79-b8e2-d6b80492b04b/what_is_a_family_therapy.pdf
    • http://lifelekufa.pbworks.com/w/file/fetch/144521700/82000088033.pdf
    • http://liwuvedesisu.pbworks.com/f/bedovapabekekan.pdf
    • http://xovakovawup.pbworks.com/w/file/fetch/144523218/laledojedupevidanizes.pdf
    • https://uploads.strikinglycdn.com/files/70c1099f-465b-4f75-9591-6476a7bbd1b1/kumuworozuvu.pdf
    • https://uploads.strikinglycdn.com/files/e65fb8fb-ab3e-4101-a8a0-f9d935ee4078/pagana_and_pagana_mosbys_diagnostic.pdf
    • https://uploads.strikinglycdn.com/files/79297f08-266d-48a8-bed4-e76d96db4391/89753319008.pdf
    • https://uploads.strikinglycdn.com/files/0ea42711-6337-4f19-aacb-b9b70a8dd94d/lg_inverter_washing_machine_user_guide.pdf
    • http://sujagajo.pbworks.com/w/file/fetch/144524412/dialectical_behavior_therapy_linehan_book.pdf
    • http://pefumugat.pbworks.com/w/file/fetch/144541536/dungeons_and_dragons_5.0_players_handbook.pdf
    • http://tasonupopam.pbworks.com/f/englisch_abitur_themen_zusammenfassung_2019.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_off0000ee63.bin
a640169c4d9a762a66f7b2947fe789bfe6c5269b13ae4fc698a4e54fb4b8a31a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE63 5612 bytes
font_01_sfnt_off0001018e.bin
35b050bf53d20d99b12fd087a2b89446115c3ad3b261dafc738d69597a2b7faf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1018E 10708 bytes

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