Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3df9f986d0d57da…

MALICIOUS

PDF

76.2 KB Created: 2021-03-21 20:51:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4776db5afcbccbbd0cc9db51a9ced148 SHA-1: b8cb1e7c277a632d5e902294079636418660f86a SHA-256: a3df9f986d0d57dada1a6587611bcc00164a5d7dc3c60f52f06dad1c9900dd51
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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://midufefew.ru/123?utm_term=benchmark+comparison+report PDF link annotation
    • https://gakujoxabusu.weebly.com/uploads/1/3/5/3/135394689/479388.pdfIn PDF document text
    • https://lijemokuw.weebly.com/uploads/1/3/4/8/134853622/zigopidasoro.pdfIn PDF document text
    • http://kixurox.getenjoyment.net/wogekipapowewetod.pdfIn PDF document text
    • http://csxmoney.info/birthday_wishes_video_for_boyfriend_freez284u.pdfIn PDF document text
    • http://lulilafemavivog.mygamesonline.org/java_projects_for_beginners_download.pdfIn PDF document text
    • https://taxudomajifi.weebly.com/uploads/1/3/4/1/134108655/1017575.pdfIn PDF document text
    • http://linavaluviriv.getenjoyment.net/how_to_change_my_modem_name.pdfIn PDF document text
    • http://bewizasosu.sportsontheweb.net/safagepibigejinan.pdfIn PDF document text
    • http://podipotekoi.ru/4716927851uo15q.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vulopekusape.atwebpages.com/focusrite_scarlett_2i2_3rd_gen_price_in_dubai.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/newry_reporter_luke_burke.pdfIn PDF document text
    • https://s3.amazonaws.com/nalifij/42947818383.pdfIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/pisarofawap.pdfIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/wesapevubonuwepolimelo.pdfIn PDF document text
    • https://s3.amazonaws.com/najipavez/format_html_code_in_atom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f8532ff-40b1-4953-936d-6a4e963bac6b/kudururufu.pdfIn PDF document text
    • https://s3.amazonaws.com/gedesisumi/tablero_calabozos_y_dragones.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04115dbb-537a-4423-8a8e-92068cc41667/best_movement_settings_warzone.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_off0000eb77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB77 5256 bytes
SHA-256: e903d9a5dba08efc353fcf49659f9f27d9b3b16d54cac379d599cf8708762f32
font_01_sfnt_off0000fd29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD29 11320 bytes
SHA-256: c1bbf58670678042fc10a5de0af374a67535bea2af139cd5446a64c9c76779a1

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