Malicious PDF — malware analysis report

Static analysis result for SHA-256 51043f06db95c44c…

MALICIOUS

PDF

82.7 KB Created: 2021-04-15 06:48:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 238b40427dea6afce9d24867d3351242 SHA-1: eaad185a0eb5af7e60d762bebc8b21d11114e914 SHA-256: 51043f06db95c44ce60069971ee7c2f96fbc610ede9cd67ce1bb9ce648cae9f0
186 Risk Score

Malware Insights

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

The PDF file contains a mass of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate this behavior, with numerous URLs pointing to external sites. While no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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 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://druttle.ru/strik?utm_term=what+subjects+are+needed+for+project+management PDF link annotation
    • https://dozetiwe.weebly.com/uploads/1/3/1/8/131856451/6409889.pdfIn PDF document text
    • https://xudufuzed.weebly.com/uploads/1/3/0/8/130815664/temefumoj-vibowonuzofu.pdfIn PDF document text
    • https://guvijubeb.weebly.com/uploads/1/3/5/3/135318684/5404635.pdfIn PDF document text
    • http://pasetbs.xyz/metal_gear_solid_4_vamp_boss_fighty5qgm.pdfIn PDF document text
    • https://vebupefipi.weebly.com/uploads/1/3/4/4/134497137/6493084.pdfIn PDF document text
    • https://cdn.sqhk.co/girasufu/eYIhfgd/snake_river_farms_steaks.pdfIn PDF document text
    • https://vobilazi.weebly.com/uploads/1/3/5/3/135300702/2197407.pdfIn PDF document text
    • http://lojapidabud.mypressonline.com/sennheiser_rs_175_headphones_australia.pdfIn PDF document text
    • https://cdn.sqhk.co/guvevifowo/jKo2oKd/chicken_drumstick_instant_pot_soup.pdfIn PDF document text
    • https://cdn.sqhk.co/naxaroja/5jfhei9/virgin_pulse_points_voucher_code.pdfIn PDF document text
    • http://help-lnstagramcopyrights-verify.com/78139644688vlduq.pdfIn PDF document text
    • http://bikejesoxatelo.mygamesonline.org/chocolate_black_and_tan_cream_red_miniature_dachshund_puppy_for_sale_nyc.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwunikuneg/gdfihih/witumuvabezoxudakil.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/gopifu/asma_ko_fir_jamise_ringtone.pdfIn PDF document text
    • http://vemesivudaro.epizy.com/36755391490.pdfIn PDF document text
    • http://novupomajanox.atwebpages.com/universal_and_kabbalistic_meditation_on_the_lord_s_prayer.pdfIn PDF document text
    • https://s3.amazonaws.com/risalenefazozo/mawatefuvo.pdfIn PDF document text
    • http://funizenobuwuka.epizy.com/9818770603.pdfIn PDF document text
    • http://birotizedu.epizy.com/what_is_law_according_to_blacks_law_dictionary.pdfIn PDF document text
    • http://kurejewupom.rf.gd/29663314895.pdfIn PDF document text
    • http://kiweleterov.epizy.com/87577584564.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/76348855765.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_off0000f588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF588 5600 bytes
SHA-256: e9ef1ee62f24862fb5a4ff8caae37dd2643a9007f791e71b4729077c2388af0f
font_01_sfnt_off0001086e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086E 11256 bytes
SHA-256: 2e3865490c2be3ca76d89643077b8006787745e7db9567e37c7542dc993c83dc
font_02_sfnt_off00012eb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB3 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34