Malicious PDF — malware analysis report

Static analysis result for SHA-256 43c13bd4895f77ef…

MALICIOUS

PDF

79.7 KB Created: 2021-09-17 15:35:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 08d000d4c2927d0651128b671f3c526b SHA-1: 6129b4c00e310a611423a9d662db67066f269979 SHA-256: 43c13bd4895f77efcaa4e40357250254b5af003c3c0a67c369e9f1b20bb87d9a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged by ClamAV as Pdf.Phishing.Trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier also strongly indicates maliciousness. No scripts were extracted, but the presence of multiple external links points to an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9762

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://synerhu.ru/uplcv?utm_term=card+wars+kingdom+app+store PDF link annotation
    • http://coolbiotech.com/upload/files/viwawisodutegokeninezado.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/fepivatajiwegesafonirubu.pdfIn PDF document text
    • http://soc-in.com/data/media/files/59558927527.pdfIn PDF document text
    • http://anpo.vn/upload/files/16076110270.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/56253361688.pdfIn PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/tosuvamisekisurebanuxadi.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/ragafepirofaf.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/xemipala.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/gurisosalonatuvaxi.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/bapujekoroxalate.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/56212891428.pdfIn PDF document text
    • https://dptech.vn/uploads/files/26573975959.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/vabozojedegasig.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/74665311402.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/pirexilotokakit.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/7362769641.pdfIn PDF document text
    • http://insuralead.com/userfiles/file/84535550905.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/dudadivujep.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/3699700261.pdfIn PDF document text
    • http://apex-architect.ru/images/file/51780859388.pdfIn PDF document text
    • http://unsersohn.ch/images/file/85918699541.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/lixawifiz.pdfIn PDF document text
    • https://oriontradecom.com/ckfinder/userfiles/files/12298701297.pdfIn PDF document text
    • https://mimpidia2.com/contents/files/8429589197.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16141fb44de972---verojibagirapukevezo.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/c350eb4324b2c6dd63c3771f19cc90f3/kamezufovafurum.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/tanoxajobosojema.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000baa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAA3 10896 bytes
SHA-256: c3c070bfafcf56055f1717b119604cdf931362cdbf29d2085d557e7b9708b2f5
font_01_sfnt_off0000d3b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC6 16448 bytes
SHA-256: 0e4cde3d5bdd5452960de995a4807c8da4ec665155a9812e2f8e54e6c49b7878
font_03_sfnt_off0001029b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029B 17712 bytes
SHA-256: a38896aa1eaedc9409b2ad35037a31570bd76cd81efe337fdd2ea78d518c9afc