Malicious PDF — malware analysis report

Static analysis result for SHA-256 52577f45affc6650…

MALICIOUS

PDF

161.1 KB Created: 2021-03-29 14:09:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: d22d9fec32b1d021206257cf8b662ba1 SHA-1: 3d918cfd6fa9121c091678415c1c496696ac15e1 SHA-256: 52577f45affc66504b5405632e683b2a1dd2405de1623526e9bf9ea394edb31c
126 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. The PDF contains numerous embedded URLs pointing to various domains, suggesting an attempt to redirect users to malicious content or phishing sites. The presence of external URIs and the link farm heuristic strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/award?keyword=freedom+of+religion+in+islam+pdf PDF link annotation
    • http://cosmicgig.com/the_wave_radio_listen_liveto313.pdfIn PDF document text
    • http://richmaya.site/domiwoforivuu2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403117/normal_603b3ade44c30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385434/normal_6022592b421aa.pdfIn PDF document text
    • https://cdn.sqhk.co/xisofofumew/5haiiWq/cyclebar_garden_city_phone_number.pdfIn PDF document text
    • https://cdn.sqhk.co/rifarako/g70OhbC/67902861202.pdfIn PDF document text
    • http://supfitket.buzz/soul_stone_simulator_all_itemslnru6.pdfIn PDF document text
    • http://disupiwalu.mypressonline.com/wufoji.pdfIn PDF document text
    • http://xevusezes.medianewsonline.com/essential_asatru.pdfIn PDF document text
    • http://uablog.website/how_many_calories_are_in_dunkin_donuts_french_vanilla_coffee1fdkq.pdfIn PDF document text
    • https://cdn.sqhk.co/bomaguvodar/ahdgjhe/ecological_pyramids_worksheet_answers_pogil.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0c7ecde5-8d52-4b6d-bf00-bcb9beb5fd3c.filesusr.com/ugd/b6f5a5_b8b25835c5b44c2897090caa63c669d2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xovajukoxin/burst_abdomen_management.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagoba/election_of_1860_worksheet.pdfIn PDF document text
    • https://4cd5eafb-d261-4666-a528-29b55b1676c1.filesusr.com/ugd/8dde66_ed349705c989471296354629ffb315f7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/budovewesekaz/catering_management_an_integrated_approach.pdfIn PDF document text
    • https://ad858f6a-7bbb-416d-9365-e04d7986ed9b.filesusr.com/ugd/3c9ac1_716c29bc28a742198e9d2d65be341349.pdf?index=trueIn PDF document text
    • https://43081b45-6e48-4b43-b724-9328fda377ae.filesusr.com/ugd/26481d_da92c9c7533c426aa0bb2355658aee68.pdf?index=trueIn PDF document text
    • http://lutepotazor.onlinewebshop.net/600_essential_words_for_the_ielts.pdfIn PDF document text
    • https://4eb83289-b313-4542-b68c-79a1d4783db4.filesusr.com/ugd/f6336d_549783040f534462a9a9534169ccfb53.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00023808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23808 5316 bytes
SHA-256: 5fdedf22c74e9a694405eef1b0bac3d6e05c3803570e2ea461672c2f9ae5f585
font_01_sfnt_off00024a0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24A0E 15348 bytes
SHA-256: 91fdd14bc5c9d2ab98e5ea65873c0bbac7a754ef7feff956884d8046c9b327b1

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