Malicious PDF — malware analysis report

Static analysis result for SHA-256 566fb0f40353222f…

MALICIOUS

PDF

68.1 KB Created: 2021-03-22 20:03:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b6795db7c3551966b26614b45c898fcb SHA-1: 696d5daaff3273fd3125980624b9708bbfda9c07 SHA-256: 566fb0f40353222fb595fdbe3b2f0aeb58a1b2292e2257707c22b9df284c288f
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 URI pointing to a suspicious domain, 'resalured.ru'. The ML classifier and ClamAV detection strongly indicate maliciousness. The document body, though heavily obfuscated, suggests a lure related to a 'four stroke cycle worksheet', which is likely a pretext to direct the user to the malicious URL for further exploitation or phishing.

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://resalured.ru/123?utm_term=four+stroke+cycle+worksheet
    • http://wopafopu.22web.org/cakewalk_sonar_full.pdf
    • http://olipaka.xyz/74335661040y7nyf.pdf
    • http://vkrowl.com/70945789611j7mty.pdf
    • http://ruwazumusef.scienceontheweb.net/xuwuwiwinanenuzazotipina.pdf
    • http://bebetadiruj.mywebcommunity.org/magolezanisux.pdf
    • http://familyit.pro/what_is_a_good_size_pressure_washer_for_home_use2xxwq.pdf
    • http://mavitrade.com/android_studio_logcat_dead85elw.pdf
    • http://fortuneo.best/dajedosorizina76hwf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://591e60e9-54e8-4b06-a9a7-f2e0522969d0.filesusr.com/ugd/1fd4b7_bbb3b339666e4ab082c9d36f0f3173e6.pdf?index=true
    • http://mexokibalu.epizy.com/golden_book_of_english_for_class_11.pdf
    • https://uploads.strikinglycdn.com/files/bdfde007-6f74-41a6-a7b4-7ac8f5e8af03/fidivojewupuradod.pdf
    • https://b064d0e4-88d6-4b7e-8087-8ebf790fcba6.filesusr.com/ugd/ca32a8_ac3e25e37adc4619853fc6cc3094a01f.pdf?index=true
    • https://4b3b4da4-1145-40fd-8a04-0ac29766dab0.filesusr.com/ugd/6c6203_939ceab687054c4ea4d360bd6894020f.pdf?index=true
    • https://s3.amazonaws.com/lodazojamuva/hssc_lab_attendant_answer_key_shift.pdf
    • https://cb6d8354-940b-4e05-9f1d-0150973ab277.filesusr.com/ugd/882da0_18733c04073c40de98fd23a6dd04373e.pdf?index=true
    • https://s3.amazonaws.com/xedewofuretujo/fiwimud.pdf
    • http://nufurezoguboli.epizy.com/14942639767.pdf
    • https://uploads.strikinglycdn.com/files/70a4f394-58e8-4fb7-b056-7b9c28e31309/10499008682.pdf
    • https://s3.amazonaws.com/pexodugosa/what_are_some_keywords_for_description_text_structure.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_off0000cdbb.bin
9496ff133d81316b09f9f8a1b7d503deeb09240323235cfeaab2bb9226983cc9
pdf-font-stream PDF embedded font (sfnt) at offset 0xCDBB 4892 bytes
font_01_sfnt_off0000de7b.bin
3b466aab3f25e6c1f609bded560d9bf6b4476257e757a0e8a159b17935c5f9ae
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7B 10296 bytes