Malicious PDF — malware analysis report

Static analysis result for SHA-256 103958db8fdf814d…

MALICIOUS

PDF

78.3 KB Created: 2021-09-20 07:59:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: befe7f35b79ba3f6c58de89325fbd14c SHA-1: 4f965736fe1435d4fd1c75b526c5a0bb2e3964f6 SHA-256: 103958db8fdf814d3d26609c5a028fdf65fab3eed175896d1975211abbbf6ab9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of external URIs and the link farm heuristic suggest the document is designed to redirect users to malicious content, potentially a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://inwebjor.ru/uplcv?utm_term=minecraft+pe+full+version+apk PDF link annotation
    • http://esipro.fr/userfiles/file/kixesisifuluzivulewujesi.pdfIn PDF document text
    • http://galerie45.com/userfiles/file/58375939125.pdfIn PDF document text
    • http://termocity.by/pics/files/gopatidegelugoze.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/39615152519.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/memabirebutaxerizuvuleta.pdfIn PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/9427097966143426e764f8.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/sujanokakupurimusa.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/wewinazekakiratejiv.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents/files/55087100044.pdfIn PDF document text
    • https://philly.drinkpoint.com/uploads/files/nujibemadenijosotuna.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/69510044530.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/18248650371.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/60212204529.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136a651b52cf---sokufipuwi.pdfIn PDF document text
    • https://lnpro.in/ckfinder/userfiles/files/80391262211.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/livurujogatu.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/55316612683.pdfIn PDF document text
    • http://dreamsurgeryen.net/ckupload/files/12853820531.pdfIn PDF document text
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/55990498415.pdfIn PDF document text
    • https://seikai.jp/free_images/files/zubuvoboralikekumujokidev.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/52316242183.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1631193960.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE42 17488 bytes
SHA-256: c5bb043b137d626ee7142e8fd939fc7bc475f238227036beb4a43e0a00575583
font_01_sfnt_off0000fb19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11330 10724 bytes
SHA-256: cebcce6cafcf3e0e9d7cbe871848327b724843b5d464a52dfcc7a0bdcc274dac

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