Malicious PDF — malware analysis report

Static analysis result for SHA-256 b357ab386f2c539b…

MALICIOUS

PDF

83.7 KB Created: 2021-02-26 13:42:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 89eb5654ea8b551ed9f3e318d709808e SHA-1: 2064af976520617d0b58eb54606deaacb56f83e9 SHA-256: b357ab386f2c539b7d9e7d029bc63fbb0430237287852be816c04a04105550d1
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 0.9998

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 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://soxebez.ru/strik?utm_term=ingenuity+inlighten+cradling+swing+assembly PDF link annotation
    • http://ludunulanara.iblogger.org/33067189335.pdfIn PDF document text
    • https://jitifawe.weebly.com/uploads/1/3/5/3/135327084/zowarotobor.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500201/normal_60019c7a0d839.pdfIn PDF document text
    • http://medebupima.sportsontheweb.net/los_5_lenguajes_del_amor_test_para_esposas.pdfIn PDF document text
    • https://tuxewuwa.weebly.com/uploads/1/3/4/7/134776055/guvigojibor_viluf.pdfIn PDF document text
    • http://jilekuxajosozul.iblogger.org/votizumadifogumapogolaxos.pdfIn PDF document text
    • https://xanikijopido.weebly.com/uploads/1/3/4/7/134738407/mikulagim.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370056/normal_5fcbf9b549a98.pdfIn PDF document text
    • http://forovasax.medianewsonline.com/32809843651.pdfIn PDF document text
    • https://resagivet.weebly.com/uploads/1/3/1/3/131383325/kuvukazuduwoni-roxetuwibe-sipiduwufofex-dejuru.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nejesezape.myartsonline.com/mercury_150_efi_2_stroke_for_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/kalanejaxutilif/guided_meditation_setting_a_morning_intention.pdfIn PDF document text
    • https://s3.amazonaws.com/somisilegex/71216686416.pdfIn PDF document text
    • http://dawobamam.epizy.com/50113578314.pdfIn PDF document text
    • http://wakinenuzubuvu.epizy.com/73116809948.pdfIn PDF document text
    • https://s3.amazonaws.com/wovedukevikov/5_minute_crafts_recycle_bottle.pdfIn PDF document text
    • http://jexititojule.rf.gd/annulment_forms_in_nj.pdfIn PDF document text
    • http://kadoxosin.atwebpages.com/inteligencia_emocional_se_puede_ensear_en_las_escuelas.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_off00010665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10665 5624 bytes
SHA-256: 68b8e9471ce4e5155662b7d78c4d67b22728735bb60c0d524a22d84d8117cfbd
font_01_sfnt_off0001196a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1196A 11736 bytes
SHA-256: 1e2d58d48c30c1efa21413a2fa37079428a891498dc40de9ae96a55beeba0071