Malicious PDF — malware analysis report

Static analysis result for SHA-256 87bd1f011ecb3a2d…

MALICIOUS

PDF

76.7 KB Created: 2021-02-26 23:12:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 1ed5f75731aabb8a991b6e6517a35d26 SHA-1: 60fe470b9c4f0dbb10e762a1bb217b3fcaf2a987 SHA-256: 87bd1f011ecb3a2de0367ca605988c18d5ce12eef26140f55d22af437cc13f92
126 Risk Score

Malware Insights

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

The sample was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, with one pointing to 'https://ponafet.ru/123?utm_term=is+there+a+place+to+donate+furniture', suggesting a phishing or scam lure. The PDF structure and the presence of external URIs are consistent with techniques used to redirect users to malicious sites.

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://ponafet.ru/123?utm_term=is+there+a+place+to+donate+furniture PDF link annotation
    • http://glasshookahcatering.com/what_are_the_principles_of_bible_study_apps04wp3.pdfIn PDF document text
    • http://weraka.online/96032597870zp3ai.pdfIn PDF document text
    • http://damvglaz1.xyz/70385320187317ic.pdfIn PDF document text
    • http://sushibara.net/manual_of_clinical_psychopharmacology_9thq15lj.pdfIn PDF document text
    • http://frankiearvelo.com/33887424255stm1b.pdfIn PDF document text
    • http://rubisteq.online/algebra_nation_section_1_topic_2_answerscdf5n.pdfIn PDF document text
    • http://wewogokuwidu.mywebcommunity.org/how_old_is_mr._darcy_supposed_to_be.pdfIn PDF document text
    • http://igcopyrightverify.com/salesforce_logo_brand_guidelinesudckv.pdfIn PDF document text
    • http://agentsecure.space/g_shock_rangeman_price_australia7jb4r.pdfIn PDF document text
    • http://zegererevez.medianewsonline.com/jipibow.pdfIn PDF document text
    • http://bikejesoxatelo.mygamesonline.org/23325316516.pdfIn PDF document text
    • http://belkwigs.com/142253186509h6cg.pdfIn PDF document text
    • http://zonerokemub.getenjoyment.net/quotes_from_ram_dass_be_here_now.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nopugorib.onlinewebshop.net/what_are_human_factors_in_healthcare.pdfIn PDF document text
    • http://liroporuki.myartsonline.com/aircare_humidifier_error_code_ec.pdfIn PDF document text
    • http://wadoromutisagar.myartsonline.com/75362936748.pdfIn PDF document text
    • http://vubelifijam.atwebpages.com/wiwabejifu.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_off0000f089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF089 5180 bytes
SHA-256: 0c931b9d6ac831958c0e27677e0c66c52ad0bba747b3d0280286f81477d8e317
font_01_sfnt_off0001021f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021F 10388 bytes
SHA-256: f4b6d1d8bfeb5b34886fc60b7f0c5b202a6d32ed910f5f049c7b038724512fd7

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