Malicious PDF — malware analysis report

Static analysis result for SHA-256 20ab856d696b0f00…

MALICIOUS

PDF

81.2 KB Created: 2021-09-17 01:31:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f1b6adc552c51a2b7d292628e5495b7a SHA-1: cf3d2fd9cdc08f35c90faff76fd729f8526c445d SHA-256: 20ab856d696b0f000e3af6cc48ab81667a48087b5d0218a7a53e2bc31d3cfec0
146 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm and a callback phishing lure. The document body is heavily obfuscated, but the presence of external URIs and the callback lure heuristic strongly suggest a phishing attempt. No scripts were extracted, but the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful websites or engage them in a scam.

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://cructi.ru/uplcv?utm_term=free+fire+headshot+tool+app PDF link annotation
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/161404a2659885---37008213485.pdfIn PDF document text
    • http://directartdeal.com/uploaded_files/userfiles/files/8446813441.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/7602240072.pdfIn PDF document text
    • http://vodova51-53.cz/files/dexotagusosozipod.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/92125961413.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/99623654219.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/28762035559.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/vefazaxajumuseniripugas.pdfIn PDF document text
    • http://rts-3.ru/upload/files/kapenesixawa.pdfIn PDF document text
    • http://ydis.kr/userfiles/file/081436183496.pdfIn PDF document text
    • http://intersonik.eu/upload/files/perel.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/d342b06c40e168199aef5ee59710b737/giwejivuj.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/66835948687.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/43830262160.pdfIn PDF document text
    • https://fundacjaartfreeart.pl/userfiles/file/duluposubidametowasifu.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/nofaxi.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/31815334039.pdfIn PDF document text
    • http://montazerangroup.com/uploader/file/83352489876.pdfIn PDF document text
    • http://integrotech.pl/zdjecia/file/palofunami.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/lenenidajozimizalagajijum.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/salijobam.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/73317581288.pdfIn PDF document text
    • http://exosushi.com/uploads/files/29345555957.pdfIn PDF document text
    • http://quaint-house.com/images/blog/file/lojofedisifenebekefi.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_off0000d8f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F9 17964 bytes
SHA-256: 747f904b14ab9d1de21f544d26c98740c707dd0ebb94269c94884dd877d4c104
font_01_sfnt_off000107c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDA 10468 bytes
SHA-256: 41172a4b0b7d36eef9bba8b73801f6a63d3210348a92811f65492fdd89e52c7f