Malicious PDF — malware analysis report

Static analysis result for SHA-256 30fa3f889c38e46c…

MALICIOUS

PDF

78.9 KB Created: 2021-03-16 11:26:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: d7e4da3d0efc2faa4ab991df40b18468 SHA-1: f24da206393a611e5ffebb184b8329d34f6fc335 SHA-256: 30fa3f889c38e46cd4fadd5cead15ae9fab293a1c0c7cba05a5ef242232e6846
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high-confidence ML classifier flagging it as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting a malicious intent to redirect users. The primary malicious URL identified is https://pelibifir.ru/strik, which is likely part of a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/strik?utm_term=can+you+sue+if+falsely+imprisoned PDF link annotation
    • http://guzexesuge.mypressonline.com/audio_amplifiers.pdfIn PDF document text
    • http://tofoxewesaxizuz.mywebcommunity.org/retrocalcaneal_bursitis.pdfIn PDF document text
    • http://xapiduxirob.mywebcommunity.org/karmakshetra_bangla_job_newspaper.pdfIn PDF document text
    • http://wijetaz.mypressonline.com/polexiti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383322/normal_60237dd9292e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382773/normal_5fd15775425c5.pdfIn PDF document text
    • http://jidokove.scienceontheweb.net/spelling_bee_words_for_grade_8.pdfIn PDF document text
    • http://3bki.ru/72663980784of3bg.pdfIn PDF document text
    • http://instapriz365.site/mojexitonimaluvoxetop478tw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412778/normal_5fe309d7c60c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369630/normal_604cc29e749e3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418001/normal_5fed4e0a4b4c4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gogujigasad.onlinewebshop.net/1074677120.pdfIn PDF document text
    • https://s3.amazonaws.com/ropidadegaxut/what_is_the_ethnic_religion_of_japan.pdfIn PDF document text
    • http://belibivizonojo.myartsonline.com/how_to_request_a_letter_of_recommendation_from_principal.pdfIn PDF document text
    • https://s3.amazonaws.com/pojikovewijeja/the_transactions_contemplated_hereunder.pdfIn PDF document text
    • https://s3.amazonaws.com/sigobija/aradhana_movie_songs_pk.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_off0000edd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD4 3080 bytes
SHA-256: 3ea9dc0fe5daeba8b7c1286de8752a991578e51b79301a8010be3d8f06b4997c
font_01_sfnt_off0000f8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DC 5196 bytes
SHA-256: 3f588043edae627bb67ed46e5b2a35375614a33238570b1cc0e65d3b7e165212
font_02_sfnt_off00010a75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A75 10376 bytes
SHA-256: a7348ac676732c681d30b1034d208926d81ee9884149f8e91bba5851d76f3ff0

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