Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dcf5629e5f42830…

MALICIOUS

PDF

85.8 KB Created: 2021-09-16 19:22:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f3b3dd55d2bcafc527f249efaae33b32 SHA-1: b945cf2d5ac9609d78ff93ce9c52c2310308fa24 SHA-256: 9dcf5629e5f428305e4a5e9e9196eaf80be3824b8e95d8942a1612f30b36cdb1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded links, many pointing to unknown domains, suggests a phishing or malware distribution scheme. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports this by identifying a link farm structure on disposable hosting, designed to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133beb813fc7---xegamexikaru.pdf In PDF document text
    • http://smartpaintingplus.com/userfiles/files/vulukotujoda.pdfIn PDF document text
    • http://mc-opony.pl/files/file/fewerinudodizimevowelizax.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/35016768888.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/88395548040.pdfIn PDF document text
    • https://hijaustabilo.com/contents/files/jimejotimajogaze.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/vatubewu.pdfIn PDF document text
    • http://dworbieland.pl/userfiles/file/61637730877.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/83039823956.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/femomuzin.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/7582784706.pdfIn PDF document text
    • https://transmilenio.net/datamont/userfiles/file/saposiwasuwigezededubak.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/bizofozisuvatepevoxola.pdfIn PDF document text
    • https://defi128.phpascal.com/userfiles/files/dipewifun.pdfIn PDF document text
    • http://dakhoanhanai.com/images/files/22688334790.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/96689107208.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/44257243794.pdfIn PDF document text
    • https://baglab.pl/galeria/file/wowonumugosifajevusisax.pdfIn PDF document text
    • http://rwdwebwebdesign.com/img-aim/files/bugapovogujorujux.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/velomup.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/23460702758.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/luririf.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/ziroriduwasijam.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210903_125652.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=watch+365+days+movie+in+englishPDF link annotation
    • 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_off0000e94c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001015e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015E 17696 bytes
SHA-256: db76ebd07f7ddf1a390625e74fe2ede7a385fbb488fca54d7c66c054e61aab85
font_02_sfnt_off00012f15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F15 11364 bytes
SHA-256: 179607aedd510e6b4be50b7a356bcb34ac99a56aa6a64903e98ccc0b7d63b659