Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d22c68e3119d2fa…

MALICIOUS

PDF

88.7 KB Created: 2021-03-28 19:05:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 620786f52b1f1ee22d4c966079fbd671 SHA-1: 672f69819a21d13cacbd57b3f9ec8f04d675f633 SHA-256: 9d22c68e3119d2fa9f0f4c603100976dec134082247385a119035400d9dd7586
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with at least two pointing to potentially malicious domains ('golowaki.ru' and 'julaximufe.66ghz.com'). The document body, though heavily obfuscated, suggests a lure related to educational worksheets, which is a common tactic for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://golowaki.ru/wix?keyword=writing+and+graphing+linear+equations+worksheet+pdf PDF link annotation
    • http://julaximufe.66ghz.com/my_grandma_got_run_over_by_a_reindeer_show.pdfIn PDF document text
    • https://cdn.sqhk.co/jenotefi/ehcMMfM/peter_answers_virtual_tarot.pdfIn PDF document text
    • https://cdn.sqhk.co/mugodetutag/jcCjbhd/city_rider_3d.pdfIn PDF document text
    • https://cdn.sqhk.co/dinigivo/FyNjb72/lojixozanepotedabitijad.pdfIn PDF document text
    • http://nubolutlion.xyz/518415964077nhjx.pdfIn PDF document text
    • https://cdn.sqhk.co/moxibusas/B3RjjDJ/3d_car_simulator_games_free_download.pdfIn PDF document text
    • http://compte-cmbretagne.best/xerapejumokalowojis1edzg.pdfIn PDF document text
    • http://nakanilo.club/thimbleweed_park_ps4_reviewb1v2x.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1ac5d900-0c69-4f12-8b1d-4e209472b8d2.filesusr.com/ugd/828753_90b0456785aa4294a6d69689bead5218.pdf?index=trueIn PDF document text
    • http://jefuxizimume.rf.gd/41711320673.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/bksb_diagnostic_answers.pdfIn PDF document text
    • http://kisalonokexiwi.atwebpages.com/vicks_vapor_plug_in_age.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/global_burden_of_disease_study_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/veledabejufi/xozokujibabawuzaladuraj.pdfIn PDF document text
    • https://s3.amazonaws.com/feliso/origami_dragon_instructions_advanced.pdfIn PDF document text
    • http://dusuvoparujizoj.rf.gd/general_5_paragraph_essay_outline_example.pdfIn PDF document text
    • http://jududupozibuj.rf.gd/74183220008.pdfIn PDF document text
    • https://044e8d80-c429-4a1f-820d-9b443c65b389.filesusr.com/ugd/53c654_be90cfb126144354a1a5f2ade384d701.pdf?index=trueIn PDF document text
    • https://d04c2b29-3777-4fe6-aaa9-ab96f87c3324.filesusr.com/ugd/43eb95_0c3110233f414b22b915f8f8a307a7c7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xomudufe/berichtsheft_koch_fertig.pdfIn PDF document text
    • https://6cdf8c5e-36a0-4b6d-987f-32d3d50030cd.filesusr.com/ugd/3c2e2e_064900ea285d4292a1d154436b121f8d.pdf?index=trueIn PDF document text
    • http://gozidonozali.myartsonline.com/diccionario_panhispnico_de_dudas_real_academia_espaola.pdfIn PDF document text
    • http://rafaturewixivan.epizy.com/assignment_agreement.pdfIn PDF document text
    • https://16e729f2-8c5c-4787-b670-14aeba6c5e03.filesusr.com/ugd/ac55e2_aa8b543e32ff4651a66d6d8639c7abb8.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000117b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B0 5600 bytes
SHA-256: 5bbed75b54570e117bbda0e6d6f1d6a5d06e94f59e55ce515a43c4b9534db36a
font_01_sfnt_off00012acd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ACD 13176 bytes
SHA-256: 72701a97eb5dc6bd6b4aaae18c575258012d3bcbba0669f407e36e0c959997f8

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