Malicious PDF — malware analysis report

Static analysis result for SHA-256 45559fb5a95725d9…

MALICIOUS

PDF

83.4 KB Created: 2021-03-29 22:37:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: f850ae3c2fcfed5e80678d7210411629 SHA-1: 2be2122c3208356e77f459dfaade2807963d763d SHA-256: 45559fb5a95725d9401af57577d37b61e9ad2c0fb1f09f2313915be8746f31b8
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are flagged as a link farm. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains text that appears to be instructions or titles, suggesting a lure. The presence of external URIs and the link farm heuristic indicate an attempt to redirect the user to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 4

  • 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://seumenha.ru/strik?utm_term=bright+starts+monkey+business+bouncer+instructions PDF link annotation
    • http://tiktokfrance.fun/thermaltake_core_v1_snow_edition_mini_itx_chassisju53g.pdfIn PDF document text
    • http://fizovovapoz.iblogger.org/50538483135.pdfIn PDF document text
    • http://feldhaus-klinker-plitka.ru/japunipotidomubovakxu3vu.pdfIn PDF document text
    • http://govitus.sportsontheweb.net/modelo_de_certificado_medico_peru.pdfIn PDF document text
    • http://kulokozataxat.22web.org/simeginutofibipe.pdfIn PDF document text
    • http://fomigiv.mypressonline.com/sample_application_letter_for_teaching.pdfIn PDF document text
    • http://citimart.online/pezodemakodeterr999.pdfIn PDF document text
    • http://vurejowug.mypressonline.com/adobe_editor_full.pdfIn PDF document text
    • http://xejapuz.getenjoyment.net/jamojo.pdfIn PDF document text
    • http://dreamingdeveloper.com/92573667982db33z.pdfIn PDF document text
    • http://zutatowatipo.mywebcommunity.org/zevivugexojexuluxiri.pdfIn PDF document text
    • http://wimesuzajomos.mypressonline.com/zudamitonogul.pdfIn PDF document text
    • http://vijevejumozugim.sportsontheweb.net/anorexia_y_bulimia_tratamiento.pdfIn PDF document text
    • http://topfrag.rip/710780112676pv99.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://xinifaduzinuvu.onlinewebshop.net/psychoanalytic_criticism_in_literature.pdfIn PDF document text
    • https://9610c43f-1b2a-4a8a-b660-75aaf3908198.filesusr.com/ugd/286fb8_e95f210d6d3a437d9bb7ef61d198a5f3.pdf?index=trueIn PDF document text
    • http://jumepenitujox.atwebpages.com/atlantic_ocean_facts.pdfIn PDF document text
    • http://jowurixidab.rf.gd/28124688817.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/fedex_store_jobs_pay.pdfIn PDF document text
    • http://dorikajiwewut.epizy.com/definition_of_communication_file.pdfIn PDF document text
    • https://s3.amazonaws.com/juwofuxufijup/what_slot_machines_have_the_highest_rtp.pdfIn PDF document text
    • https://8767aa75-4bd5-48c0-94ca-24e983238001.filesusr.com/ugd/debdc1_99db40efc3a048e5b2ea61fce25694bc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/linksys_velop_bridge_mode_performance.pdfIn PDF document text
    • https://s3.amazonaws.com/kudefem/cpr_latest_guidelines_2015.pdfIn PDF document text
    • http://vipiwimepi.epizy.com/holyrood_nursery_shaw_ofsted_report.pdfIn PDF document text
    • https://b7e73dfe-ad35-4791-b4f7-7500f5b7882c.filesusr.com/ugd/bc79a4_80371946a5dc49f6a4f8c6a159298b85.pdf?index=trueIn PDF document text
    • https://b3079848-b07e-4d89-9244-05dfa5dd91fe.filesusr.com/ugd/3ab5ed_511f7f26568f4c0e8718c7a7d3357543.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA27 5416 bytes
SHA-256: f2d26d678c9f98716b2fed9c060a7abc2fff85850bc9bf43e4f65c016d96411a
font_01_sfnt_off00010c7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7D 10828 bytes
SHA-256: 9659df9658bb1fa7210d9d795bdb252d117956910e271fe1dfc7f6dee49384d2
font_02_sfnt_off00013155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13155 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3