Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9e040448aed84ef…

MALICIOUS

PDF

86.7 KB Created: 2021-04-18 16:30:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 22b24a8ebf756503592abbcaefc87342 SHA-1: 2e4e6e18629876b1fdf5a051df531aef05bf69d3 SHA-256: c9e040448aed84efec774fc36d389a305ef5f19be5d746bb9bf6d07d1955efec
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, containing numerous external links, many of which point to disposable domains or are used for SEO manipulation. The primary URL, 'https://jottigo.ru/strik?utm_term=the+ones+who+walk+away+from+omelas+book+review', suggests a lure related to a book review, likely intended to attract users through search engines. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/strik?utm_term=the+ones+who+walk+away+from+omelas+book+review PDF link annotation
    • https://pigukoziluluz.weebly.com/uploads/1/3/4/8/134896600/pegonuxivokadot-linedekarodavab.pdfIn PDF document text
    • https://watibovogop.weebly.com/uploads/1/3/4/8/134876481/watojaje_zifimokijezobat_wolemazusuro.pdfIn PDF document text
    • https://xirovule.weebly.com/uploads/1/3/4/7/134749068/2c9d30391.pdfIn PDF document text
    • https://lojapajarete.weebly.com/uploads/1/3/4/5/134521209/xajoni-xirunelad-mojanikezomazi-sotezilov.pdfIn PDF document text
    • http://xewodatesuporob.mypressonline.com/program_edit_freeware.pdfIn PDF document text
    • https://dodanopo.weebly.com/uploads/1/3/1/4/131408738/2884543.pdfIn PDF document text
    • https://pimejowutaviju.weebly.com/uploads/1/3/4/4/134495028/wevikezezotilonaso.pdfIn PDF document text
    • https://tibiwurab.weebly.com/uploads/1/3/2/6/132695994/bepogadu_gikutikojobu_pepuziza.pdfIn PDF document text
    • http://tuzojexis.mypressonline.com/abordagem_humanista_na_educao.pdfIn PDF document text
    • https://xoravali.weebly.com/uploads/1/3/0/7/130775395/3795426.pdfIn PDF document text
    • https://fivarebaxuru.weebly.com/uploads/1/3/5/3/135326201/78a41331.pdfIn PDF document text
    • http://pifadopagel.scienceontheweb.net/pejivegizetedilapomit.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
    • https://s3.amazonaws.com/zebarufuridorur/asthma_treatment_guidelines_2018_canada.pdfIn PDF document text
    • https://s3.amazonaws.com/boxujetanonikuv/gegavesomo.pdfIn PDF document text
    • http://tudixuzaw.onlinewebshop.net/qualitative_descriptive_study.pdfIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/what_is_a_substituted_benzene_ring.pdfIn PDF document text
    • http://gomugugagaf.onlinewebshop.net/divergent_book_chapter_25.pdfIn PDF document text
    • https://7d6e376e-1ee3-4df5-88c1-8d1511d419f8.filesusr.com/ugd/7dd30d_6bbcc88bd03e49bbbb9d6961b3a779ff.pdf?index=trueIn PDF document text
    • https://12c9c681-cafc-4f88-93da-cb6f471fd49a.filesusr.com/ugd/f09a9d_6091fa0be7b9403590e6a01ab64fab83.pdf?index=trueIn PDF document text
    • http://zugepoguj.onlinewebshop.net/90897145198.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_off000108fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FA 5120 bytes
SHA-256: 81d8681e637be049000451e5f49adc66a94874665cc9c99a35a57187ed86de4d
font_01_sfnt_off00011a45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A45 11112 bytes
SHA-256: 6bb9cf4496a11c58cc5415a98bc32f06e6410909fb03a37f4033ced758223c92
font_02_sfnt_off00014029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14029 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333