Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b063b8a70a71e13…

MALICIOUS

PDF

69.5 KB Created: 2021-03-20 20:06:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4df1c1a434315252af07c06d2656f1a9 SHA-1: 271c345be64ead0d4cf95c212c7098995986cb0c SHA-256: 0b063b8a70a71e13d0cc50a378eca2e610094875babb802a2a3676c29c37811b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating the presence of external URIs and embedded URLs. The document body, though heavily obfuscated, suggests a lure related to 'transformations of trig functions worksheet pdf', indicating a phishing or social engineering attempt. The presence of multiple unknown and potentially malicious URLs further supports this. The wkhtmltopdf authoring application suggests it may be a generated PDF, possibly exploiting a known vulnerability.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/wix?keyword=transformations+of+trig+functions+worksheet+pdf
    • http://gililofus.medianewsonline.com/arquitectura_barroca_en_inglaterra.pdf
    • http://ubzvp.com/zakebifunane5ip.pdf
    • http://tafugegajotu.mygamesonline.org/34284769055.pdf
    • http://mylevel.store/88080186842iu1s.pdf
    • http://lazujifoxupa.getenjoyment.net/how_to_clean_ratchet_straps_by_dirt_farmer_jay.pdf
    • http://nowukusox.mypressonline.com/zuxulaxove.pdf
    • http://vozobatenaw.mywebcommunity.org/laboratory_equipment_and_their_functions.pdf
    • http://realwockyc.info/merriam-websters_pocket_spanish-english_dictionaryq8lc4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jinabisura/22173073031.pdf
    • http://fuvamawijivef.atwebpages.com/blood_bowl_roster_download.pdf
    • http://tafiwepamubov.atwebpages.com/zogenadedilu.pdf
    • http://mojogisi.epizy.com/davafejenidakafitu.pdf
    • https://e60c805d-b9e1-47fc-b045-983511e9ac1f.filesusr.com/ugd/116bb2_a6a18d5a3e5545918251d920f5f4f8e7.pdf?index=true
    • https://f421159b-d329-41e8-bc42-072bc93e4c50.filesusr.com/ugd/65d6f7_ee20c8603fd342cc914c73c600659094.pdf?index=true
    • https://s3.amazonaws.com/rujabepifar/teacher_s_guide_math_10_module_2.pdf
    • http://vawekud.epizy.com/a_r_c_launcher.pdf
    • https://s3.amazonaws.com/gezejoputiwinu/cevdet_bey_e_hijos.pdf
    • https://s3.amazonaws.com/sajatofubote/bigibele.pdf
    • https://a29d81ee-e589-4368-99bd-4e0be04eb4c0.filesusr.com/ugd/a89e6e_4bcd7e938fdb44a98e498f1072cfcfcc.pdf?index=true
    • https://s3.amazonaws.com/firudegix/crabs_adjust_humidity_card_list.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_off0000d205.bin
3249304eca1207e8e34de16ea4f00b0197db56bf84f1e975db0058b7ccfdd934		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD205 5644 bytes
font_01_sfnt_off0000e524.bin
77cc627dc0f939d59bddcfdfb2dd3d4d0509297c0d30bd3c48a4f3617ea5aa9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE524 10364 bytes

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