Malicious PDF — malware analysis report

Static analysis result for SHA-256 050ecb7e3b5047e8…

MALICIOUS

PDF

69.8 KB Created: 2021-09-13 23:11:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 08a185d1a45144fa25318ef2ed6a3ab9 SHA-1: bbe2f1b68056bac9112f0858a54ee2bfee833750 SHA-256: 050ecb7e3b5047e8db6bf18e29e03eabda510d8a6f4ac687b3c590bfbb57bbe5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external PDFs hosted on various domains, indicating a link farm designed to obscure the ultimate destination. The presence of a Google feedproxy URL, though marked benign, suggests an attempt to disguise the malicious nature of the links. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further complicating analysis but not detracting from the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 http://antonellascarpittadesigner.it/userfiles/files/36451754550.pdf In PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/pataw.pdfIn PDF document text
    • http://lawngo.net/fckfiles/nuzis.pdfIn PDF document text
    • https://omnistopbollards.com/application/third_party/ckfinder/userfiles/files/pejawidizevawigegadudew.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/76947191627.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/17305823915.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d80ab0ad8f---givapowuw.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/lizagirawodokagos.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/famubosakawogo.pdfIn PDF document text
    • https://harmony.im/userfiles/file/54034858055.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/ximitixumera.pdfIn PDF document text
    • https://hediyelikhanem.com/calisma2/files/uploads/jiwojuwivalu.pdfIn PDF document text
    • http://coomargroup.com/ckfinder/userfiles/files/65299555595.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/40166304093.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/50491382059.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/67170067050.pdfIn PDF document text
    • https://danielfelber.ch/userfiles/file/55262185849.pdfIn PDF document text
    • http://psn-monolit.ru/img_file/files/nepumusiraposob.pdfIn PDF document text
    • https://ags-car.com/upload/files/83860402404.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/rezabijasebo.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/jorumebawejupu.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac42b84c3c---duxifaxavatumunase.pdfIn PDF document text
    • https://braus.uz/images/shared/file/zogus.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/80848729366.pdfIn PDF document text
    • https://sukaunited4d.vip/contents/files/30165988016.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/23252048196.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=desktop+live+wallpaper+free+download+for+windows+10PDF link annotation
    • 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_off0000b486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB486 10912 bytes
SHA-256: 034dd4b40e07c821bcc0b73c0028a264b6709c740c26caf2b79279f2db6bfa15
font_01_sfnt_off0000cdfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDFD 14348 bytes
SHA-256: e86019cb265211cfee7812e7245f855e0625c88101dfb124d23024237857bdd5
font_02_sfnt_off0000f18b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1