Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c21e339b9197519…

MALICIOUS

PDF

88.9 KB Created: 2021-09-19 18:33:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 958069d34a3bd0710a6a599ac5e4468f SHA-1: 5d6b035aba05f9148d9d58e15671b2bbb65762dc SHA-256: 0c21e339b9197519e209e4bc29c04f46805af9ad58b3c18fe8e4a83d1b4b3aab
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous external URIs and is described as a link farm on disposable hosting, indicating a strong intent to redirect users to potentially harmful sites. The PDF structure and embedded URLs suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://allytemp.ru/uplcv?utm_term=gun+mayhem+friv PDF link annotation
    • https://sharmtocairo.com/userfiles/files/fopototeno.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/podiloporidifotokubonux.pdfIn PDF document text
    • http://warehousetraining.ie/images/rixoguzelobetidinuforubo.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/f421el55mgfcllstrioplae1jn/56209212656.pdfIn PDF document text
    • http://nscenter.cn/upload/files/dezamo.pdfIn PDF document text
    • https://mimpishio1bet.com/contents/files/motoduvonikasoromuriv.pdfIn PDF document text
    • https://latework.cz/soubory/nufaxisutasiliwojite.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/80511142370.pdfIn PDF document text
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/duriziniv.pdfIn PDF document text
    • http://awards.nl/img/cms/file/vobobapo.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/86910285050.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/34401417986.pdfIn PDF document text
    • https://computerzone.pk/file/zogesetiwofagulajugo.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-17/20210917203438679153.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/33739462411.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/ximebof.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161451074e2811---51714886222.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/44092148890.pdfIn PDF document text
    • http://xn--2o2b17g32e8xisqq.com/userData/board/file/88771081417.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/46815274669.pdfIn PDF document text
    • http://investgeorgia.ge/userfiles/file/tatunuzomidi.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/78578670485.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/fazibelojemufivovidode.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_off0000f38c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38C 10368 bytes
SHA-256: 08fe6563f5f3a0ddbab7f062e95f66674737a6da6c1b9a786d8b7aa29a5e9286
font_01_sfnt_off00010abe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABE 20084 bytes
SHA-256: e9163a84fdc89958bdb64efff60185ee3991d354db1e426386da9bd6ee7d3664
font_02_sfnt_off00013e57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1