Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a769b0520056e0d…

MALICIOUS

PDF

83.9 KB Created: 2021-10-07 20:07:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 393f8677eb6417311e6123a0c05ab653 SHA-1: a65d8af084da5175d3e76a6b050f808e588557be SHA-256: 4a769b0520056e0d4e09db813cc2629b18ee5c9dbfeaaa5fbc8f041a61924246
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains or link farms. 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 exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://oniceh.ru/uplcv?utm_term=meaning+of+scattered+thunderstorms PDF link annotation
    • https://eurosan.pl/user_images/file/88938228013.pdfIn PDF document text
    • http://spiregene.com/image/files/20210915_135413.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/18911746902.pdfIn PDF document text
    • http://ifap.it/images/file/14230637876.pdfIn PDF document text
    • http://unseretochter.ch/images/file/36960321207.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/12627256350.pdfIn PDF document text
    • https://tgvl.in/uploads/fck/files/51956708791.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/23364336604.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/15215762516.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/koxijebadav.pdfIn PDF document text
    • http://qishuochem.com/siicea/userfiles/file/57032175312.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/85913592868.pdfIn PDF document text
    • http://e-hematologica.com/users/file/88706484747.pdfIn PDF document text
    • http://herve-coiffure.ci/files/vulusisuxonolifubavo.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161460eda950e8---69151460532.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/sibowemuditote.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/kupuzitadozebulugadonumok.pdfIn PDF document text
    • http://www.prakashirrigation.com/uploads/fck/files/92629203721.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2d3f905c82edf34a97d6f0e9050a6709/88924158897.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/pumunodawowurenubevadifo.pdfIn PDF document text
    • http://medwin.kr/userData/board/file/15662984798.pdfIn PDF document text
    • http://protectakoteasia.com/ckfinder/userfiles/files/tuvesotet.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/dujujebukanixodewelinipaz.pdfIn PDF document text
    • http://rs-entp.com/upload/file/83248575295.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_off0000df27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF27 19140 bytes
SHA-256: 612f0d47a63256114c46c932c25963550811093799875da566b7c1c9f13974be
font_01_sfnt_off000110b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B4 10972 bytes
SHA-256: 96921ff17ddbe353e6aaf8aa6d9ada1a21427b35ddc429f1e182d7cd29f583db
font_02_sfnt_off000129cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1