Malicious PDF — malware analysis report

Static analysis result for SHA-256 28279b762b59032d…

MALICIOUS

PDF

67.1 KB Created: 2021-05-19 00:32:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8fbd78ce6a52453fabab89eda9247e0d SHA-1: 0f8be643f79fee48b5d873ce7f0beef3360e4967 SHA-256: 28279b762b59032d7caea7f07b66b8b15f51e74a6ded1d95b890e5825d984c5a
156 Risk Score

Malware Insights

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

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 0.9998

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jottigo.ru/strik?utm_term=free+chichewa+audio+bible+download PDF link annotation
    • https://vuzeruferule.weebly.com/uploads/1/3/4/5/134591890/tiferidufadi-mobovabex-filuvos-mutosa.pdfIn PDF document text
    • https://fubomagasikeka.weebly.com/uploads/1/3/4/4/134474343/xugovodixiv.pdfIn PDF document text
    • https://vutakajar.weebly.com/uploads/1/3/4/8/134896426/besijisepawevup.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/jedaxopopuko/55235647162.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/game_theory_applications_in_real_life.pdfIn PDF document text
    • http://lapabogi.rf.gd/3595182838.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/maudsley_prescribing_guidelines_in_psychiatry.pdfIn PDF document text
    • https://s3.amazonaws.com/gurafoga/android_9_note_8_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/gumagabu/ice_sheet_and_polar_desert_plants.pdfIn PDF document text
    • https://s3.amazonaws.com/rodakarugupoko/twilight_eclipse_full_movie_download_in_hindi_filmywap.pdfIn PDF document text
    • https://s3.amazonaws.com/savifin/60699315916.pdfIn PDF document text
    • https://s3.amazonaws.com/palevijuj/xipefuvutileb.pdfIn PDF document text
    • https://s3.amazonaws.com/fejakixoweka/kexemipukanonedifusov.pdfIn PDF document text
    • https://s3.amazonaws.com/wofaxil/64615971102.pdfIn PDF document text
    • http://dedalumakur.epizy.com/86546242751.pdfIn PDF document text
    • https://s3.amazonaws.com/galinikagopit/40772410403.pdfIn PDF document text
    • https://s3.amazonaws.com/filidabut/gold_shield_vector_free.pdfIn PDF document text
    • https://s3.amazonaws.com/lanubili/alphabet_letters_worksheets_for_kindergarten.pdfIn PDF document text
    • https://s3.amazonaws.com/boxujetanonikuv/12118917141.pdfIn PDF document text
    • http://susebuxusebug.epizy.com/xawopenijag.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA66 5036 bytes
SHA-256: f8dd90a900a6154a13b467dde82dedfc162e6e398d4725250cdae18afc359e11
font_01_sfnt_off0000db91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB91 10468 bytes
SHA-256: a90d100b431b5b5226e35aa37b7eb6adb961f2c6c5e49643c3ba47602ff19da9

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