Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0a476628bdf832e…

MALICIOUS

PDF

68.6 KB Created: 2021-09-26 20:03:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 04277f95a193e198d46ed5e1873296db SHA-1: 5612f76a4201cc7fa6373e2b90ba3e00071272fb SHA-256: b0a476628bdf832efb2bbdbf716532039ebc9b511010f052f78e9ebe88356ddd
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also contains numerous external URIs, many of which point to disposable domains and are structured as link farms, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the execution of JavaScript to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pixomot.ru/uplcv?utm_term=how+to+recover+data+from+factory+reset+android PDF link annotation
    • https://xlquality.com/userfiles/file/lujepolu.pdfIn PDF document text
    • https://rumahbaruku.com/contents/files/98959120851.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/kakojefizezizelotavo.pdfIn PDF document text
    • http://realtor-madrid.com/uploades/fckeditorfile/fapunodife.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/mubuzokazib.pdfIn PDF document text
    • https://aiwcecckolkata.org/FCKeditor/file/20803953994.pdfIn PDF document text
    • http://electriccityusa.com/images/fck_uploads/file/lozovapuraxin.pdfIn PDF document text
    • http://tanabuauto.com/js/upload/files/zotawupepawetiwun.pdfIn PDF document text
    • http://hongsung114.com/files/fckeditor/file/65146613777.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/weruzoroladovikefojuxat.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/11665623659.pdfIn PDF document text
    • http://theblare.com/image/upload/file/31529619509.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/zipugerarivolupixi.pdfIn PDF document text
    • http://ihanzao.com/userfiles/file/20210920124634_1308147405.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/povuzemawobufix.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/161419a89b8d47---zulepetilalirotoremopuxig.pdfIn PDF document text
    • http://objets.immoweiss.lu/userfiles/files/46639736749.pdfIn PDF document text
    • https://unosms.us/userfiles/file/zegimotoxajizojuliwiz.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/tukiso.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/45620618999.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/72733241732.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/21924665997.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16136437943d7e---dasexoke.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_off0000ae49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE49 14788 bytes
SHA-256: 3e47d17dbb43419caaecc201103e7b6c435bee436bdc1695b28ffe41365f8d08
font_01_sfnt_off0000d353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD353 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6A 10848 bytes
SHA-256: 7575ee6d02d393a74b0380c2939d81ca972172f59aed76d0056c48426b4818d2

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