Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1a8a90fc07f2074…

MALICIOUS

PDF

85.3 KB Created: 2021-03-20 05:15:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 123b8c5b6e18edf65bb90fedb5f09062 SHA-1: 0c4cd9e130341e1416ad4a0b59bb5282debc1f67 SHA-256: b1a8a90fc07f2074f88fa20562fa67db34a7143cafa235fab07f8341cc76642a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and one specific URL, 'https://ponafet.ru/strik?utm_term=how+to+check+printer+ink+levels+on+ipad', is flagged as suspicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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/strik?utm_term=how+to+check+printer+ink+levels+on+ipad PDF link annotation
    • https://cdn.sqhk.co/ridasozewe/Xhggejb/tudefemunizuzipefize.pdfIn PDF document text
    • http://wudebakafepi.mypressonline.com/yardsticks_book_used.pdfIn PDF document text
    • https://cdn.sqhk.co/wazikunal/bzCvigC/dentist_assistant_job_near_me.pdfIn PDF document text
    • http://zeboxagekej.sportsontheweb.net/computer_organization_and_architecture_syllabus_iit.pdfIn PDF document text
    • https://cdn.sqhk.co/givifevulo/p3icsji/circle_colored_pencil_art_tutorial.pdfIn PDF document text
    • https://cdn.sqhk.co/kobadaxo/jijeia7/74022214175.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390330/normal_6015d3051d7fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464541/normal_6022875e7d11a.pdfIn PDF document text
    • http://gupozatu.22web.org/34247425762.pdfIn PDF document text
    • http://xotizel.iblogger.org/5482618496.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493578/normal_603930a845d64.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://bafemiw.epizy.com/river_city_ransom_store_guide.pdfIn PDF document text
    • http://dulasugemekiv.epizy.com/migetiraniriwudobuxupaz.pdfIn PDF document text
    • http://dinorafox.epizy.com/anatomy_of_spinal_cord.pdfIn PDF document text
    • http://vigexosav.myartsonline.com/38342567934.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b294f31-0db9-4afd-84c5-327fcab41138/starcraft_remastered_gameplay_pc.pdfIn PDF document text
    • http://zaninenuj.rf.gd/sibitasenolurega.pdfIn PDF document text
    • http://bobujosu.epizy.com/linearity_worksheet_3_answers_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1eab2ed1-2cc5-4e14-97d2-a8a410b3a732/best_angularjs_book_for_beginners.pdfIn PDF document text
    • http://nidomuku.rf.gd/where_does_the_word_fear_originate_from.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62c6f7db-f211-4805-9619-27ecdaa8a6e2/the_true_grimoire.pdfIn PDF document text
    • http://zefixufedinokas.epizy.com/10558560796.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C6 5124 bytes
SHA-256: 662534ab149ad5ec30ca185a226884141be7ace39730aedc3c3dd60f79cb068a
font_01_sfnt_off00011435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11435 10836 bytes
SHA-256: e9479b9625631bd3841cdb67936ab2b8ff8699d8cf5d89c03d891c5bf7bb6f01
font_02_sfnt_off00013948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13948 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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