Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a3306a2aa45b999…

MALICIOUS

PDF

69.7 KB Created: 2021-02-11 20:20:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a378f7307278b15e7edcfa37342d881d SHA-1: 840f710ba6abc09ffc28bf87d678b7c3819b0000 SHA-256: 3a3306a2aa45b99944a1113aa3f68114b35ef5c310378d40a0485b27d64ba100
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 0.9991

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 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://bologen.ru/123?utm_term=blue+worksheet+preschool PDF link annotation
    • https://cdn.sqhk.co/nazujovo/rghhIlK/go_viral_lyrics_blueface.pdfIn PDF document text
    • http://form-lnstagramverificationbadge.com/tabutekapuz6u1qi.pdfIn PDF document text
    • http://alkim.xyz/93650897568zvk1x.pdfIn PDF document text
    • https://sujanumijixedi.weebly.com/uploads/1/3/4/5/134501714/melobirotolorok_sadujepoju.pdfIn PDF document text
    • https://cdn.sqhk.co/duburijudi/0uDEPXk/digestive_biscuits_target.pdfIn PDF document text
    • https://nazuvunu.weebly.com/uploads/1/3/4/4/134438845/zinativomitom_jinow_deboxuxiku_samufipan.pdfIn PDF document text
    • https://fikomepa.weebly.com/uploads/1/3/5/2/135299400/31d974e.pdfIn PDF document text
    • https://cdn.sqhk.co/tokarikadez/baEgfoO/66657940882.pdfIn PDF document text
    • https://cdn.sqhk.co/wufevinek/1oBVfz9/free_gems_clash_royale_hack_espanol.pdfIn PDF document text
    • http://nakidki-alkantara.xyz/69197428502opz3i.pdfIn PDF document text
    • https://cdn.sqhk.co/lukapokobejo/ZjiCLkz/sigisesokatumunax.pdfIn PDF document text
    • https://cdn.sqhk.co/xewasejeve/q7ghhgd/77183554853.pdfIn PDF document text
    • https://titumakusijuvap.weebly.com/uploads/1/3/4/3/134353199/bugejumax.pdfIn PDF document text
    • http://reliables.ru/facebook_messenger_video_call_free_download_apk945k6.pdfIn PDF document text
    • http://sbrf.link/19901717548lo0o.pdfIn PDF document text
    • https://cdn.sqhk.co/rupomotiz/uRQKkjf/84064994474.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/mexavofezoxi/41756816129.pdfIn PDF document text
    • https://s3.amazonaws.com/kujesulad/digesulonazagudixogaw.pdfIn PDF document text
    • https://s3.amazonaws.com/zugutixe/mirabuximupudovar.pdfIn PDF document text
    • https://s3.amazonaws.com/lefemijip/noxogon.pdfIn PDF document text
    • https://s3.amazonaws.com/retisovojor/introduction_naval_architecture.pdfIn PDF document text
    • https://s3.amazonaws.com/feborobegibew/44895681316.pdfIn PDF document text
    • https://s3.amazonaws.com/xezonijida/vasanubexet.pdfIn PDF document text
    • https://s3.amazonaws.com/bisute/neumonia_neonatal_2019.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_off0000d4d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D0 5016 bytes
SHA-256: 1700d6f37cac9a8cdb02ee90e221eaff6244eb27ca731984d9e6e6a515688a1a
font_01_sfnt_off0000e5f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F7 10444 bytes
SHA-256: 0100da952aeb39ada0aa33f6b76a0e1b73d49f6d62f7859a8f57fc4b376307e3

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