Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcc0fd44bed4673a…

MALICIOUS

PDF

68.6 KB Created: 2021-09-27 09:59:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 974732176ecafc75302257d7ca4b842e SHA-1: 7300c3fd0c5ac1ed74a36c882a0ef455c4f50e7c SHA-256: dcc0fd44bed4673a84533bf46f645be4d6e7cf3b9ee5c0169c81622c4791fa09
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and external URIs suggests the document is designed to exploit vulnerabilities or redirect users to malicious sites. The 'SE_CALLBACK_LURE' heuristic specifically points to a callback phishing or tech-support scam pattern, where users are prompted to call a number, likely to extract sensitive information or trick them into further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • 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://medvor.ru/uplcv?utm_term=eng+to+kor PDF link annotation
    • http://czminghe.com/upload/files/jajixaxab.pdfIn PDF document text
    • http://gajagotour.com/UserFiles/file/gunufinizezazago.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/89659194580.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-9-5/20210905124808566142.pdfIn PDF document text
    • http://escrima-rlp.de/userfiles/file/webagasogoporenol.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/murovujunobevemaditigin.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/6598237582.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/wavuxixufuluramodimofube.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/70422900094.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/wuxurexozusobokivoxi.pdfIn PDF document text
    • https://yifff.se/userfiles/file/96104015036.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/74431651726.pdfIn PDF document text
    • http://scro.ru/pic/file/ziferokovibolir.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/13368322857.pdfIn PDF document text
    • https://andhimazhai.com/images/files/97121675060.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/48625367140.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/56283075604.pdfIn PDF document text
    • http://abwessex.com/uploads/files/zenotudugefizotiz.pdfIn PDF document text
    • https://dawnraytech.985.tw/data/file/userfiles/files/voxamorasukexepazotunopu.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/67907866930.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/92pjhn32qtff5i5q6po4u45m34/denofepamonusinire.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/62332984317.pdfIn PDF document text
    • http://zlzljc.com/uploadfile/file///2021090309594814.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_off0000ae39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE39 16508 bytes
SHA-256: cea9951cecadb96178b0b4bf356c59db611942ced9902ca48d181e2dec8bb7a9
font_01_sfnt_off0000d7d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000efee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEE 9756 bytes
SHA-256: 172cd306d9071c4c922d494f71179f44b82aa2ce24aca36f84dabd23ba193258