Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbcde086fb8f3850…

MALICIOUS

PDF

75.6 KB Created: 2021-06-12 02:35:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 18051ff3176906abdfe51f15ba63b19d SHA-1: 302a63e54ab45d144964b3d95a54e633762075f0 SHA-256: dbcde086fb8f3850c56334f2ffaeebcb6e3e79c760ec6f12f68d0bca5ac0d8bc
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and link farms, indicating a phishing or distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a common phishing lure, likely intended to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://synerhu.ru/pbw?utm_term=cup+stacking+challenge+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481847/normal_605f8e63dadb9.pdfIn PDF document text
    • https://masagefila.weebly.com/uploads/1/3/4/5/134505888/gafogologuxapip.pdfIn PDF document text
    • https://wirujofijiv.weebly.com/uploads/1/3/4/5/134592393/fdb6a7281.pdfIn PDF document text
    • https://retenosarubus.weebly.com/uploads/1/3/2/6/132695405/wexepi.pdfIn PDF document text
    • https://xidawelopumez.weebly.com/uploads/1/3/4/4/134439163/lifajekegodiwiw_xadakijo_xinirude_totizifori.pdfIn PDF document text
    • https://sibotapitagota.weebly.com/uploads/1/3/4/3/134378411/9d05fba.pdfIn PDF document text
    • https://lobixeximoruse.weebly.com/uploads/1/3/5/3/135319822/konigapodizi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376105/normal_603c2dc355c2c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/320e0475-86af-41bf-984d-43173635d9c8/stock_exchange_open_on_weekends.pdfIn PDF document text
    • http://luwapoveduvi.pbworks.com/f/mathematical_statistics_and_data_analysis_chapter_2_solutions.pdfIn PDF document text
    • http://dupalalo.pbworks.com/f/download_movie_shaadi_mein_zaroor_aana.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b3cfe7b-d373-48ff-bfa7-e5d95b5a70c3/35643931317.pdfIn PDF document text
    • http://fokurid.pbworks.com/w/file/fetch/144766263/gta_v_wasted_sound_download.pdfIn PDF document text
    • http://mujusevo.pbworks.com/f/chicco_keyfit_30_infant_insert_washing_instructions.pdfIn PDF document text
    • http://nuxawakaxaz.pbworks.com/w/file/fetch/144574296/lidakavet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fbfd5f9-92b9-4763-8f0b-adfa415e2dd2/treasurers_report_template_free.pdfIn PDF document text
    • http://podimil.pbworks.com/w/file/fetch/144492060/dissertation_sur_lafrique_berceau_de_lhumanit.pdfIn PDF document text
    • http://fajopab.pbworks.com/w/file/fetch/144941343/xazotamarujov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8e63ccb-fb6e-4872-ba79-b409257e02e6/fisher_price_my_little_lamb_platinum_2_cradle_n_swing.pdfIn PDF document text
    • http://luwapoveduvi.pbworks.com/f/vuruvijike.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_off0000e7f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F1 5256 bytes
SHA-256: 3c6beee259583a1238d4a99dfe64b1229640c621a5934a149bac8a3f91c7d642
font_01_sfnt_off0000f9d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D9 11156 bytes
SHA-256: ac1222ff4c5b30ad3238ba6ebea1eb5bf7866273d3888e1ae1ea851584850959

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