Malicious PDF — malware analysis report

Static analysis result for SHA-256 194e194d54534430…

MALICIOUS

PDF

72.7 KB Created: 2021-09-16 11:33:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ee342c0e872692ea5af344c162587430 SHA-1: 85dd7855591703f80ea53c0f3510355b86d4acf3 SHA-256: 194e194d545344301094fb1fa9a97793685b4647c71a8c0c5f01b6934179fde5
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=can+you+leave+a+fridge+on+its+side PDF link annotation
    • http://urduhadith.org/survey/userfiles/files/fobifuruziwuwatedud.pdfIn PDF document text
    • https://jotelek.hu/files/file/nepedibazuvirok.pdfIn PDF document text
    • https://kubermatkaplay.com/ckfinder/userfiles/files/finovegadedabomugupo.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/wuwopale.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/28744371280.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/59343414996.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/zitosulokavabajof.pdfIn PDF document text
    • http://headrepublic.pl/images/files/kawonopame.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/jinif.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/73918517894.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/81768791006.pdfIn PDF document text
    • http://krakowska98.com/zdjecia/fck/file/37806321361.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/lupivilajanoxogutiwekew.pdfIn PDF document text
    • http://ailizia.com/userfiles/gilevig.pdfIn PDF document text
    • https://diamond-marketing.cz/soubory/81863444891.pdfIn PDF document text
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/53649364210.pdfIn PDF document text
    • http://shopcode.ru/uploads/file/zajejatamiwinuxav.pdfIn PDF document text
    • https://hijaustabilo.com/contents/files/3876647614.pdfIn PDF document text
    • https://altsovmun.ru/userfiles/file/17600008656.pdfIn PDF document text
    • http://gimnazjum-krasiczyn.pl/img/userfiles/file/fewokuzukosisumok.pdfIn PDF document text
    • http://hidrometa.com/images_upload/files/winodaxim.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/xaxesib.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/1631567405zuzepamapuliz.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/c5f7fafbd1f7bb6bbd997c272e2e68f0/94207414633.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210916102619597.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_off0000bc6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC6B 15524 bytes
SHA-256: 1e3f802d59723e7baac68597e531807b687de5cc3a6681b7087b3da31126bc4c
font_01_sfnt_off0000e3d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fbef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEF 10840 bytes
SHA-256: 9e1301165a990a8b2202fa47de0753ff006a159337238f306fbb163c1cf5b99c