Malicious PDF — malware analysis report

Static analysis result for SHA-256 54a7b7ca17d6988d…

MALICIOUS

PDF

88.2 KB Created: 2021-03-28 13:51:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f4d36367170ced2245046cf42173f9cc SHA-1: b251bd360b989eafc282ecaec58dcabb7259014c SHA-256: 54a7b7ca17d6988d51ac95755a8ff2818f0d1b497f1fbb5b1dff101e29128636
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://mezovuduw.ru/123?utm_term=hubspot+email+marketing+certification+answers+2018 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4479226/normal_5ff1ed55f0a9c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460241/normal_5ffed49aa854e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424935/normal_60172c7400ea6.pdfIn PDF document text
    • http://vubitim.sportsontheweb.net/what_is_agile_development_team.pdfIn PDF document text
    • https://cdn.sqhk.co/givifevulo/hh7KUhb/minecraft_classic_texture_pack_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483587/normal_6041840c55dd8.pdfIn PDF document text
    • https://cdn.sqhk.co/dapubebireba/6BRujii/riders_on_the_storm_the_doors_concerto.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382960/normal_5feb7e70ee24a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467581/normal_60489c4c6af36.pdfIn PDF document text
    • https://cdn.sqhk.co/fegukajebaj/idAUicI/hku_food_and_nutritional_science_internship.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412591/normal_5feafd5de605a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505699/normal_603547838df8d.pdfIn PDF document text
    • http://zutumufedige.getenjoyment.net/dogoxowojitifemabugixun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390996/normal_602c38d240af1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d1897088-ef6e-4b60-8303-910b4b551fc1.filesusr.com/ugd/4cfbbd_98239afefcb747bfa1951433bd407f13.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/385c710f-7ef6-47de-a289-642111337f73/naeyc_standards_for_early_childhood_professional_preparation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/224f5bcc-5139-43da-944d-61128a7fa4b6/how_to_make_distilled_water_video.pdfIn PDF document text
    • https://161abad2-7de2-49bb-9904-d6e2a620a662.filesusr.com/ugd/2eec94_8e4df6b718a34b3592058ecb6229ba93.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d224d671-0fd3-40e0-ad44-999904f35812/why_does_my_samsung_sound_bar_not_work.pdfIn PDF document text
    • http://xarilupinedup.myartsonline.com/giwede.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15624c25-ba2f-47c3-ac87-88afc18f2f89/war_of_the_worlds_book_2_chapter_5_summary.pdfIn PDF document text
    • https://f9c81679-ddb1-4746-ab40-32673edc426c.filesusr.com/ugd/2eff39_4fb176aa8ac24ef49d80e8815cb7284a.pdf?index=trueIn PDF document text
    • https://506dbbd1-d4b3-44b1-a4c9-6b5d0cab6a23.filesusr.com/ugd/c75f60_6efb659b45744e95be0ffafa77fb4590.pdf?index=trueIn PDF document text
    • http://jupevesu.atwebpages.com/nuwidonedimuvojufawaj.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011a6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6D 6112 bytes
SHA-256: 19e4aa3e2e1dbb6ad30867eb188b1ff303dc424be0c0ecbaed43c36caa360b7a
font_01_sfnt_off00012f33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F33 10428 bytes
SHA-256: 21d6c657449e531d2c2b2a4924800ec1448e0a77ac5164917e468c92980b852d