Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6d31f9def5a8786…

MALICIOUS

PDF

80.4 KB Created: 2021-03-26 09:33:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 36d8b7f93f065ea6a7255c28b58582b7 SHA-1: ea354edd253185ce620ba5240ce336d7e96ed33b SHA-256: a6d31f9def5a878641f09b61bb276f6a983c72490d16dcd07139f129689331b1
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/123?utm_term=ausable+river+michigan+fly+fishing+report PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4428342/normal_602d0980d45fa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389804/normal_5ff25c0ec4d15.pdfIn PDF document text
    • http://phulop.store/cardinal_newman_high_school_sixth_form1e2kq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473041/normal_603ae88586ea5.pdfIn PDF document text
    • http://degifutuv.scienceontheweb.net/fazetosefumipagojuxur.pdfIn PDF document text
    • http://re-capital.ru/film_frozen_flower_korea2s6vj.pdfIn PDF document text
    • http://pedaxofanor.mywebcommunity.org/new_oxford_thesaurus_of_english.pdfIn PDF document text
    • http://pawusewi.sportsontheweb.net/agile_scrum_methodology_tutorial.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428033/normal_5fda23f5248a8.pdfIn PDF document text
    • http://kigadotezolesun.mypressonline.com/circuit_switching_and_packet_switching.pdfIn PDF document text
    • http://womotov.22web.org/bc_auditor_general_report_on_mining.pdfIn PDF document text
    • http://kepuxom.mypressonline.com/dorilivuxarebidopesoka.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387052/normal_5fe5edf3e757e.pdfIn PDF document text
    • http://nepefaxox.22web.org/diy_braava_jet_pads.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366319/normal_604cc0f92f34b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dukexajuj/dorerimimatagazumug.pdfIn PDF document text
    • http://pavemamixazose.rf.gd/basic_tactics_for_listening_second_edition_teacher_s_book.pdfIn PDF document text
    • http://winulinimax.rf.gd/dagopelumujujusafo.pdfIn PDF document text
    • https://s3.amazonaws.com/foneniz/fufevomorusanewovagux.pdfIn PDF document text
    • https://s3.amazonaws.com/ravuxudibure/tornillo_sin_fin_y_rueda_corona.pdfIn PDF document text
    • https://s3.amazonaws.com/tapelu/17089848524.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DF 5720 bytes
SHA-256: f098b1114e11fbdbe31b1307398dbd65246469f62154d43760924f45549e92b9
font_01_sfnt_off0000f73e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73E 11428 bytes
SHA-256: 4522f9f1eadac881fcdd72b084789bb823fe462e13433e8c62c07ceaeb0ec1cd
font_02_sfnt_off00011e97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E97 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15

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