Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac40d8f4058b281d…

MALICIOUS

PDF

81.1 KB Created: 2021-09-19 09:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4a5213c50e2c6c20e0ae62eccba0dc39 SHA-1: ea39e4820b35b71b35227653a9545a1a2155bca6 SHA-256: ac40d8f4058b281d1730d9b68a5ef8c9cb4fbd9f8df940c78f6540f3b4f2af6b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URLs, many on disposable domains, suggests a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and external links are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://medvor.ru/uplcv?utm_term=free+online+document+viewer PDF link annotation
    • http://adabaskimerkezi.com/upload/file/xamavanejibinat.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/47891000017.pdfIn PDF document text
    • https://koparieshorvathbusz.hu/files/file/97551353434.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/7a96a4f2f4ccbc4bacf032a32fcdd04a/85489009728.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/69924044783.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff76596396---42792846815.pdfIn PDF document text
    • https://thibiditrading.com/public/userupload/files/26108105717.pdfIn PDF document text
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/25556752378.pdfIn PDF document text
    • https://cmoretv.com/userfiles/81307288451.pdfIn PDF document text
    • https://fitness-sport.it/userfiles/file/84004187056.pdfIn PDF document text
    • http://fjsxsx558.com/upload/files/89834084031.pdfIn PDF document text
    • http://loaamtran.com/files/usersfiles/files/85597335901.pdfIn PDF document text
    • http://dsagco.com/Upload/file/56339413371.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/jituvekotagozosikokeju.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/sepotepabovoso.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/88520917636.pdfIn PDF document text
    • https://comfort8889.com/upload/files/80787594620.pdfIn PDF document text
    • http://llux.vn/uploads/files/467521359.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/18628087616.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/marefibiwirodowotadot.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/76266056828.pdfIn PDF document text
    • http://zuszdounky.cz/files/3380514936.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/gidexukabala.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_off0000d84f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF061 18028 bytes
SHA-256: 8572c486cd87b875d224d4b09930b515b8c3250ccb97c6e2f30d201e29172bf6
font_02_sfnt_off00011f23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F23 10432 bytes
SHA-256: 9378f214b695377c790d4c1638a9ba1bc57028309fd54d5477dffbd08cd299b5

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