Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecc560eba37cf87c…

MALICIOUS

PDF

71.5 KB Created: 2021-02-17 02:33:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 82dfdbdf6bf8444c8672a48cf28ba4f1 SHA-1: 78658c2deb3441bb1e0347f0100acd2d088838c8 SHA-256: ecc560eba37cf87c739ae963a1e8839817b3d767ed6260679b2110891dfe840a
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, with one prominent URL, 'https://seumenha.ru/strik?utm_term=how+to+write+a+romance+novel+step+by+step+pdf', suggesting a phishing or malware distribution lure. The document body, though heavily obfuscated, contains metadata related to PDF generation, reinforcing its role as a container for malicious links.

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://seumenha.ru/strik?utm_term=how+to+write+a+romance+novel+step+by+step+pdf PDF link annotation
    • http://guitar.su/how_to_clean_my_sunbeam_heating_pad3q2xg.pdfIn PDF document text
    • https://rizafosukozesal.weebly.com/uploads/1/3/5/3/135346652/luwogojetag.pdfIn PDF document text
    • https://redelonoxoti.weebly.com/uploads/1/3/1/6/131606094/jijewunitixubo_tozufab_menogilo_gopejos.pdfIn PDF document text
    • https://nedalejurozawo.weebly.com/uploads/1/3/0/7/130776692/3279505.pdfIn PDF document text
    • https://cdn.sqhk.co/fapetemiji/GhbaZcD/17432661827.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380705/normal_5fdf6d02e38a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473053/normal_5fd26d1783b3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467576/normal_5fdb02de99c92.pdfIn PDF document text
    • http://salleapp.xyz/insanity_exercisesn0gqp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411682/normal_5fdf2d8bafd08.pdfIn PDF document text
    • https://nunajamedagafep.weebly.com/uploads/1/3/5/3/135325778/kuroxonubanuvew.pdfIn PDF document text
    • http://luminar4-download.xyz/kabinorutikejepakusawud35p47.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vixuwogetiv/arizer_solo_2_instruction_manual.pdfIn PDF document text
    • http://sidukumu.epizy.com/situational_analysis_report_template.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/fbise_date_sheet_ssc_2019_class_9.pdfIn PDF document text
    • http://zumewozuzetarun.epizy.com/wowhead_eternal_palace_mythic_guide.pdfIn PDF document text
    • http://mukokulag.epizy.com/luxilegekuloj.pdfIn PDF document text
    • http://rafopaju.rf.gd/latex_beamer_template.pdfIn PDF document text
    • http://kanisisasulaba.rf.gd/adobe_photoshop_free_new_version.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/96051837534.pdfIn PDF document text
    • https://s3.amazonaws.com/guxosa/64403662713.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_off0000da41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA41 5656 bytes
SHA-256: 67e20a7a032ce638b9400f5c80e2d38f9b6b81033939c795247b89f68eda93ca
font_01_sfnt_off0000ed7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7B 10384 bytes
SHA-256: 3cfa2ea9b3c4ceda57e8d63e42c16d940f358dd834ebd45f29ca11166823e312

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