Malicious PDF — malware analysis report

Static analysis result for SHA-256 32a4fb4d90eb503b…

MALICIOUS

PDF

173.2 KB Created: 2021-04-02 11:54:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 2dca18ada7f1a7bcbb610831f5edf12a SHA-1: 1e0a2dbb02c07313b685c1c1136a8e2ad0d309e8 SHA-256: 32a4fb4d90eb503ba328786fd84c91a29f86db9ccb8110d31a10b1fbc7a67898
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are flagged as link farms. One prominent URL, 'https://xajibur.ru/award?keyword=buku+biologi+sma+kelas+x+erlangga+pdf', is presented in a way that suggests it's a search result, likely to trick users into clicking. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://xajibur.ru/award?keyword=buku+biologi+sma+kelas+x+erlangga+pdf PDF link annotation
    • http://zujewap.mygamesonline.org/sbi_atm_card_request_form.pdfIn PDF document text
    • http://gezakiribonenin.mywebcommunity.org/affinity_photo_workbook_german.pdfIn PDF document text
    • http://xoxuvajes.mywebcommunity.org/rubrik_penilaian_writing_descriptive_text.pdfIn PDF document text
    • http://lagujegivupani.22web.org/general_partnership_agreement_sample.pdfIn PDF document text
    • http://miribut.mywebcommunity.org/personal_budget_template.pdfIn PDF document text
    • http://gobegoxox.22web.org/an_occurrence_at_owl_creek_bridge_questions_and_answers.pdfIn PDF document text
    • http://vetebozo.mypressonline.com/83077058422.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pekamidakoj.atwebpages.com/ralixalizakidukito.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3968a1b8-9248-4dec-b659-5af304a4a07a/left_behind_lyrics_cg5.pdfIn PDF document text
    • https://655b5f2c-2f45-4411-b579-7e5bd587bf3d.filesusr.com/ugd/2a272b_66afcb4664c24774991bb97f067f2bbc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4816f292-08d2-477e-a34d-a252c1413c46/jukevabumavutoze.pdfIn PDF document text
    • http://pikugire.epizy.com/58868608819.pdfIn PDF document text
    • http://furipurisebete.onlinewebshop.net/tavefikomux.pdfIn PDF document text
    • https://09d56968-2ae9-412d-ad86-e67dc63a1c23.filesusr.com/ugd/e8b91f_0f06f2ed72e249eaa8815b567b4e2aa2.pdf?index=trueIn PDF document text
    • http://ligiwekuxote.myartsonline.com/88858001883.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48b71f47-7b59-45aa-b82d-0f4389c1b70d/1392115929.pdfIn PDF document text
    • http://gojexigubobe.epizy.com/riesgo_psicosocial_formas_de_prevencion.pdfIn PDF document text
    • http://bixozebaxikapos.atwebpages.com/zotumuvir.pdfIn PDF document text
    • https://33b7cf8b-1cb2-46d9-9063-17e97cba5e80.filesusr.com/ugd/9edd50_ae27860862cc444c8f3ef36d6c7e40ff.pdf?index=trueIn PDF document text
    • http://misanedajog.myartsonline.com/apprendre_le_franais_vocabulaire.pdfIn PDF document text
    • https://2b08c346-38d8-4763-b559-bb9d4fff2313.filesusr.com/ugd/40c9d6_148f3aacc14c40b492f1a0c308196283.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/425ed5bf-7c26-4d7c-a242-e43b23a6be6b/96593398031.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_off00010c95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C95 110292 bytes
SHA-256: a2d8c01648dbfc8e05de3c619a19b20e92af47ffcac716d8d6e6525ef3d62fb1
font_01_sfnt_off000253af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x253AF 5684 bytes
SHA-256: a5000928fa68899852c21bef1e06aa121f22af294b72b1da5c5da24239f6072c
font_02_sfnt_off000266fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x266FB 11996 bytes
SHA-256: 415c693fe292df8d6acd926ed10d241935eb4c8dd2ac7cfefdbfcc7bdd9fb9e0
font_03_sfnt_off0002906e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2906E 16308 bytes
SHA-256: a04791c9ff5dc65e23e5841265e38299a5b1bbf3b86a513f6a159a3725d68de5