Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b6564852710d035…

MALICIOUS

PDF

79.8 KB Created: 2021-04-01 18:00:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 032f3aa89bea08aeb168014c31894565 SHA-1: 3274483bbcaf2581f6360845288dad9ffff2a2c2 SHA-256: 5b6564852710d0353008903c502914f231b20b41f97ddfd2c1b5ffd004981dad
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as a phishing trojan. The presence of external URIs and the nature of the PDF structure align with techniques used to redirect users to malicious sites for credential harvesting or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://xezojetit.ru/123?utm_term=opencv+find+affine+transformation+ransac PDF link annotation
    • http://psylath.com/laxerikodoveduwuluxipubadmn27e.pdfIn PDF document text
    • https://cdn.sqhk.co/fipimomozuk/lqu5jje/71997296613.pdfIn PDF document text
    • http://sijemogezabusa.sportsontheweb.net/dizuzawifokevimudo.pdfIn PDF document text
    • http://dommasters.site/how_to_cook_a_brined_turkey_from_trader_joesu9wgw.pdfIn PDF document text
    • https://mowuvesetotodoj.weebly.com/uploads/1/3/0/9/130969800/jedino-zafaguv-zeluguseroku.pdfIn PDF document text
    • https://berisojelo.weebly.com/uploads/1/3/0/8/130874511/ziropopevid_xuzetuxoso_jukewosoto_kuguda.pdfIn PDF document text
    • http://xezixaz.getenjoyment.net/xemume.pdfIn PDF document text
    • http://sedugarawale.22web.org/22236742736.pdfIn PDF document text
    • https://zumofimuletoxol.weebly.com/uploads/1/3/4/0/134018509/b0d34fa6.pdfIn PDF document text
    • http://jidogirikar.mygamesonline.org/94689096686.pdfIn PDF document text
    • https://cdn.sqhk.co/wupefukawis/ajexha2/24956826731.pdfIn PDF document text
    • http://erkutungotu.com/64271006901zq5ti.pdfIn PDF document text
    • http://xatovapotogu.mywebcommunity.org/61219754262.pdfIn PDF document text
    • http://compte-cmbretagne.best/37637056525n7pxk.pdfIn PDF document text
    • https://vimedapajabapi.weebly.com/uploads/1/3/5/3/135309909/joladib.pdfIn PDF document text
    • https://podesasi.weebly.com/uploads/1/3/1/4/131437149/jubevafusa.pdfIn PDF document text
    • http://tolagipifumer.iblogger.org/xifuwigejejero.pdfIn PDF document text
    • https://cdn.sqhk.co/tinolaseja/iFjhnhf/lozamokazok.pdfIn PDF document text
    • http://lozipazom.sportsontheweb.net/larowewumonagerud.pdfIn PDF document text
    • http://persequenteamsohbet.com/209031618c1gvf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mogivinisisa.epizy.com/38475273211.pdfIn PDF document text
    • http://manuwakagekewu.onlinewebshop.net/buxisif.pdfIn PDF document text
    • http://vaxoponawa.rf.gd/62637160545.pdfIn PDF document text
    • http://sujunutab.atwebpages.com/business_strategy_sample.pdfIn PDF document text
    • http://zigatepuralut.rf.gd/javadepu.pdfIn PDF document text
    • http://gitodake.myartsonline.com/what_is_the_mode_median_mean_and_range_in_math.pdfIn PDF document text
    • http://zegiwewezenaro.myartsonline.com/general_biology_1_book_grade_12.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_off0000ed43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED43 5356 bytes
SHA-256: f90d69788a79b218d0819266741c824c28abde4fb59e6f2f79642db8e5a563d2
font_01_sfnt_off0000ff61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF61 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off000107ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EE 11908 bytes
SHA-256: b25200fb0320c2548311ed89078a0ba6fa580e5308e22e5e4932d41b1e2737f7