Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef9a5bebb6e3cacd…

MALICIOUS

PDF

81.5 KB Created: 2021-02-21 08:14:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 7cc1ff08f1f12df6f1179111fbd72d1f SHA-1: afddf67323d0d84ecb167348f72a8e11915a365e SHA-256: ef9a5bebb6e3cacd5a5adbb35224a4a51f2fff4a7265501d3f0204f94318f330
186 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 0.9996

Heuristics 6

  • 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 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.
  • 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://crophysi.ru/wix?keyword=cyberpunk+2020+modules PDF link annotation
    • https://gabubogoko.weebly.com/uploads/1/3/3/9/133997439/f05ba.pdfIn PDF document text
    • https://cdn.sqhk.co/zejizoguzut/idhi2ji/black_country_music_hall_of_fame_members.pdfIn PDF document text
    • https://cdn.sqhk.co/jututumogu/1oVKFjd/filling_large_holes_in_yard.pdfIn PDF document text
    • http://springwin.space/car_service_schedule_templateg2trl.pdfIn PDF document text
    • http://serviceforyou.site/why_does_my_westinghouse_fridge_keep_beepingi5maf.pdfIn PDF document text
    • https://bijimuxe.weebly.com/uploads/1/3/4/8/134886115/bawexopojopu_bipegipavuwif.pdfIn PDF document text
    • http://memaviwebepa.22web.org/fisoxufiribigevekabemof.pdfIn PDF document text
    • https://podogavefa.weebly.com/uploads/1/3/1/4/131438056/nefamezarig.pdfIn PDF document text
    • https://nudabixe.weebly.com/uploads/1/3/4/5/134505388/selidixipa.pdfIn PDF document text
    • https://vajefusuvujob.weebly.com/uploads/1/3/4/4/134464162/4027505.pdfIn PDF document text
    • https://dorikorojuj.weebly.com/uploads/1/3/3/9/133987202/c26a787be3f.pdfIn PDF document text
    • https://cdn.sqhk.co/verikiweneza/hfJgegd/top_100_robinhood_stocks_today.pdfIn PDF document text
    • http://dipurenirexo.22web.org/cules_son_las_amenazas_de_seguridad_ms_comunes_en_el_uso_de_los_expedientes_electrnicos.pdfIn PDF document text
    • https://fowowudajij.weebly.com/uploads/1/3/5/3/135312379/6019907.pdfIn PDF document text
    • https://lozorodarefela.weebly.com/uploads/1/3/2/6/132681783/litoripelubir-figewe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://teworubinogo.epizy.com/arma_3_lakeside_life.pdfIn PDF document text
    • http://vuxibir.rf.gd/53932983714.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/36516123427.pdfIn PDF document text
    • https://s3.amazonaws.com/kukazowox/tokyo_drift_full_movie.pdfIn PDF document text
    • http://vilusosexar.epizy.com/free_vector_magic.pdfIn PDF document text
    • https://s3.amazonaws.com/bizamesuwepe/gojakisunovamotomareriwi.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_off000102b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B2 5380 bytes
SHA-256: a88a52b87ee2b269ae81695598b35a2f1e313965e4dc288aa6189f11c07497a7
font_01_sfnt_off000114eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114EB 10716 bytes
SHA-256: 92ba264422532f13468b21aa7157bd236e58f8180b08f216305c61d6516e5e73

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