Malicious PDF — malware analysis report

Static analysis result for SHA-256 f81f644901b3bc0a…

MALICIOUS

PDF

72.6 KB Created: 2021-09-19 21:37:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0bcd23b27338189651f3bb469a935d9e SHA-1: a29577ec2cc4ee35b0e1080bea9f7dbfb1d3e42c SHA-256: f81f644901b3bc0a9669a69dade5d10a05a010028144c5aeb2e42ce138d7d207
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://wastran.ru/uplcv?utm_term=automate+tasks+android PDF link annotation
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/sabetuvewaxasusux.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/15123996665.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/33373183018.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16135b6beb67f7---bokowijavajefosin.pdfIn PDF document text
    • http://yigang-lin.com/uploads/files/202109141335358527.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/54081093023.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/64464063225.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/55095939270.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/8224319326.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/xabesirajowoxeb.pdfIn PDF document text
    • https://stvorki.ru/files/file/41664069593.pdfIn PDF document text
    • http://ptk-tent.ru/userfiles/file/lowiwifawe.pdfIn PDF document text
    • https://odlingfamily.com/userfiles/file/bolenorumakolurasezadabot.pdfIn PDF document text
    • http://phunggia.biz/userfiles/file/34553618828.pdfIn PDF document text
    • http://slxiang.com/v15/Upload/file/2021961731112996.pdfIn PDF document text
    • http://aguito.madteam.net/ckfinder/userfiles/files/81695078004.pdfIn PDF document text
    • https://md-bud.pl/szklo/photos/file/78617402681.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/diniwaxopojofudo.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16132362824da3---mavuroso.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/46556350266.pdfIn PDF document text
    • https://lapdonline.org/file/xikojorupeseletosabun.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_off0000b8e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F9 17024 bytes
SHA-256: c537c799a45a893374325518f9af55cc00c725912ff5ed4b3aa8d5c233a4c16b
font_02_sfnt_off0000fc9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9C 10536 bytes
SHA-256: 2571e4a01fecf8faf143d24067d0b8a784254cb453d09254e4573d5090f5c579

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