Malicious PDF — malware analysis report

Static analysis result for SHA-256 31e4c1171b35c001…

MALICIOUS

PDF

68.4 KB Created: 2021-09-24 21:09:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a9a0742c4f22c2a56dafbcbf54d08bb4 SHA-1: c5c33d06e0fd94205182794cb7adb313098321e0 SHA-256: 31e4c1171b35c001ed7f46fe40772e225c8690a983f768515ca3e4eb7c704c2a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is identified as a phishing lure using a screenshot. It directs users to external URLs, one of which is a redirector for a movie-related search term, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nomylo.ru/uplcv?utm_term=wazir+full+movie+watch+online PDF link annotation
    • http://chinawin-consult.com/userfiles/nozozetegikisufaku.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/6010256698.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3dede30dc---63979161182.pdfIn PDF document text
    • https://gallerylingard.com/uploads/file/49961943693.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/repupudatixetiga.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/90372435275.pdfIn PDF document text
    • https://bagstyle.uz/images/file/40472275260.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/90712371073.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/xinulem.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/63555257882.pdfIn PDF document text
    • https://securitydm.eu/slicice/file/56361373338.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/fuzogelijujatiwaxot.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/29422060664.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/55167927065.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/patotawel.pdfIn PDF document text
    • http://www.bash.cl/media/file/957013139.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/taxezomesekip.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/wepazeno.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/zelivuzoz.pdfIn PDF document text
    • https://flomogroup.com/upload/files/67338210978.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/45878142214.pdfIn PDF document text
    • https://inprovitecuador.com/ckfinder/userfiles/files/tukibupe.pdfIn PDF document text
    • http://thebodyclubonline.com/userfiles/file/kedebalipifabib.pdfIn PDF document text
    • http://ranchobg.com/img/file/pajuwizowetuje.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/detanofeza.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_off0000afe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFE0 10736 bytes
SHA-256: 3276731a936d6367e19810d58a212bdf8d737e184c4cb762c0c7d02c89182a41
font_01_sfnt_off0000c86f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC86F 14356 bytes
SHA-256: 2af162ad7599ea705db0e118a882c445c461ceecd6143b335dc5c9f26efd8d34
font_02_sfnt_off0000ec29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1