Malicious PDF — malware analysis report

Static analysis result for SHA-256 810fc14f1ba8511f…

MALICIOUS

PDF

71.0 KB Created: 2021-09-21 15:09:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4d57b32d230902fcb2fcd48dc4fce7f0 SHA-1: 5843c5649b17f15887bbba9e627580efffeab7ae SHA-256: 810fc14f1ba8511f2018441f949f9ee329c92dbaefe1001b03ecd37036ac7e4c
126 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. The PDF contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting a phishing or malware distribution lure. The primary attack vector is likely Spearphishing Attachment, with the PDF exploiting vulnerabilities or tricking users into clicking links that lead to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://irlanc.ru/uplcv?utm_term=organic+synthesis+notes+pdf PDF link annotation
    • http://etspak.com/survey/userfiles/files/tutaxuzalam.pdfIn PDF document text
    • http://cesarrodarte.com/userfiles/file/rexuvudatalewikuweze.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/24636616810.pdfIn PDF document text
    • https://kolegium.inaheart.org/upload/files/purezifi.pdfIn PDF document text
    • http://jucal.es/images/file/67974206265.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/kukolokegufim.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/wunajibazeli.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/83083062414.pdfIn PDF document text
    • http://bzws.zhanyougame.com/ckfinder/userfiles/files/sijukobadarijale.pdfIn PDF document text
    • https://micsys.in/userfiles/file/kamuj.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/54860864726.pdfIn PDF document text
    • http://bbbo.handyfriendship.com/upload/files/55750805284.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/xulame.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/4jttgk31fahkipnhc4gina4bkc/65052300000.pdfIn PDF document text
    • http://www.vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/9815244886.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/jaxinuwojegema.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/18922852195.pdfIn PDF document text
    • http://syntrend.critical.tw/upload/files/dasijonuvawupenomesox.pdfIn PDF document text
    • https://ww150002.linebot.net/upfile/files/20210906104433.pdfIn PDF document text
    • http://rowerowaszkola.pl/imgturysta/files/lomugomajonesa.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/xitudadu.pdfIn PDF document text
    • https://kozmetikadunakeszi.hu/userfiles/file/40962121722.pdfIn PDF document text
    • http://vectorma.ru/uploads/assets/file/wepexakofapebotilozofik.pdfIn PDF document text
    • https://tanhaithanhvalves.com/quangcao/admin/file/kifadivo.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_off0000b52c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB52C 10992 bytes
SHA-256: 0f50515d8a080eeb4c44d3c70db929b18f8bb45943b03edcbe9f4414cdc2410b
font_01_sfnt_off0000ce82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE82 15620 bytes
SHA-256: 893859cd4bb4307c0c3c6281173558b1cad428c7955ff21c61dd1079f6ed6881
font_02_sfnt_off0000f684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF684 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.