Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc036cd84191afa6…

MALICIOUS

PDF

152.2 KB Created: 2021-03-14 11:43:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: efd422dde886e94da92359294cc77434 SHA-1: 2f1d1b0784049af5177fc3ef1f10e769c15af468 SHA-256: bc036cd84191afa66b375a59231d9d34d5bd1def130196803ce7969cab5ceb4c
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded URLs pointing to suspicious domains, such as 'nipisod.ru' and 'gajozemexip.22web.org', which are likely used to host phishing content or download further malware. The document body, though heavily obfuscated, suggests a lure related to educational worksheets, a common tactic for social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/award?keyword=solving+equations+word+problems+worksheet+pdf PDF link annotation
    • http://gajozemexip.22web.org/viluxekidozif.pdfIn PDF document text
    • http://buputenajonix.mywebcommunity.org/adda247_current_affairs_may_2020.pdfIn PDF document text
    • http://appless.space/pugodxt37v.pdfIn PDF document text
    • http://zesenadozefut.sportsontheweb.net/26913465319.pdfIn PDF document text
    • http://lollipopa.online/school_calendar_template_google_sheetsnejxn.pdfIn PDF document text
    • http://femuxeririta.mygamesonline.org/charles_dickens_a_christmas_carol_first_edition_value.pdfIn PDF document text
    • http://bagesopabiwub.scienceontheweb.net/19060002997.pdfIn PDF document text
    • http://cherrypimp.online/fundamentals_of_engineering_review_manualb9aij.pdfIn PDF document text
    • http://help-nanny.site/acre_of_diamonds_storybt45l.pdfIn PDF document text
    • http://allostar.buzz/515847488658lixz.pdfIn PDF document text
    • http://urolog.xyz/how_does_justice_help_societyuxwzu.pdfIn PDF document text
    • http://jafalule.22web.org/64177135313.pdfIn PDF document text
    • http://auto-fishing-rods1.club/the_true_measure_of_a_man_martin_luther_king7sq01.pdfIn PDF document text
    • http://site-shop.xyz/beach_wallpaper_freet19ft.pdfIn PDF document text
    • http://normal-id.com/shadowing_mr._m_worksheet2u9r6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ce3fa27-5423-4ff0-b94d-ad28bb0698a1/pirates_of_the_caribbean_medley_piano_musescore.pdfIn PDF document text
    • http://towidono.rf.gd/jomifibilurotexulajuzobo.pdfIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/cap_guidelines_idsa.pdfIn PDF document text
    • http://kalawutef.rf.gd/azar_grammar_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/wegugus/cd_rom_drivers.pdfIn PDF document text
    • https://s3.amazonaws.com/tofizo/80123073583.pdfIn PDF document text
    • http://gorumefu.rf.gd/origami_cranes_step_by_step.pdfIn PDF document text
    • https://s3.amazonaws.com/fukepez/ceramic_cookware_reviews_consumer_reports.pdfIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/up_b._ed_application_form_2019_fees.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d18ca58f-d3d0-412a-8f98-904a7217d744/how_do_you_oil_a_grandfather_clock.pdfIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10084 86420 bytes
SHA-256: 310f5db93d8f1e1bfabaff1af53eaed86024fa9ec6c27971aaa633ccfef1874c
font_01_sfnt_off000202a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x202A4 6040 bytes
SHA-256: c4574313f16f634ccf8285df0a4a79c90669ab72b0b35cb26ce9a99ee0574246
font_02_sfnt_off00021717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21717 10408 bytes
SHA-256: 39daefb1548dc6ec146b7ae7d937413d3198815baa04f4d445484ffc40b161e2
font_03_sfnt_off00023ae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23AE3 17188 bytes
SHA-256: ad1f660211f11423d3a38e4054f274655a50751a3ad248c45724fa4140d33d42