Malicious PDF — malware analysis report

Static analysis result for SHA-256 7150be4b2880f3aa…

MALICIOUS

PDF

81.1 KB Created: 2021-05-12 10:19:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: a4f53c2ecf9839b26c729d88664718fe SHA-1: e724600c1a41e11fe1496e7590b7944985d05ff5 SHA-256: 7150be4b2880f3aaff994171f92f4f2de9c63f9920dff2a2ee1ded04f47d5b4e
66 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. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, appears to reference technical content, suggesting a lure to disguise malicious links. No scripts were extracted, but the presence of many external URIs suggests an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://bologen.ru/strik?utm_term=stein+complex+analysis+solutions+chapter+4 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450719/normal_606c634aabd9b.pdfIn PDF document text
    • http://zolomakowifop.iblogger.org/theory_of_alternating_current_machines_by_langsdorf.pdfIn PDF document text
    • http://shopyou.online/how_to_get_media_attentionav7lj.pdfIn PDF document text
    • http://all-host.site/raputatasegijof6gl0k.pdfIn PDF document text
    • http://sobakin.space/persuade_inform_entertain_chart79d7u.pdfIn PDF document text
    • http://obzorov.site/ios_11._4_for_iphone_62esgi.pdfIn PDF document text
    • http://vitavolu.22web.org/dowalujaziluxo.pdfIn PDF document text
    • http://taxutipepavij.iblogger.org/mukamidezexagesuxijajeb.pdfIn PDF document text
    • http://rukozhop-guide.com/cool_black_wolf_wallpaper_hdu3436.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419211/normal_60004a18d47f5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378405/normal_5fc799e241f5b.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://gawataxilonok.rf.gd/acselerator_quickset_manual.pdfIn PDF document text
    • https://91ca87c2-c493-4616-adaa-fbcec45394e1.filesusr.com/ugd/6116da_f88196d17ec6498c8fa6132673bcf77b.pdf?index=trueIn PDF document text
    • http://jebajenalow.epizy.com/adobe_sign_document.pdfIn PDF document text
    • https://s3.amazonaws.com/xaliwalufoguni/interim_report_card_template.pdfIn PDF document text
    • https://s3.amazonaws.com/kagedatabujo/basic_english_grammar_class_10_quiz.pdfIn PDF document text
    • http://relogevavikidid.epizy.com/salems_lot_book_ending_explained.pdfIn PDF document text
    • https://s3.amazonaws.com/tigewibejageju/xilojezaludipejen.pdfIn PDF document text
    • https://s3.amazonaws.com/sefepugolupalax/237439453.pdfIn PDF document text
    • http://xajumin.epizy.com/nemogujelofijexedake.pdfIn PDF document text
    • http://vowajug.rf.gd/certificate_template_free_download.pdfIn PDF document text
    • https://c4647614-9ff8-4b00-b819-08dc938bd166.filesusr.com/ugd/5d3f24_631d834e16ab45e299c36a5722f75b2d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bomupi/hp_laserjet_p1006_printer_driver_free_download.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCB 5416 bytes
SHA-256: 1d5fcce00db83c570c599dc7647fb6fbd0be395c9d33c05b3396e533f6a75c69
font_01_sfnt_off0000ff09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF09 12248 bytes
SHA-256: 2e9b06e016a0a34c8498d412ad682dd5fe45a08f5c049768c5ced33e896011cb
font_02_sfnt_off000128be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128BE 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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