Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd173138c578c265…

MALICIOUS

PDF

68.4 KB Created: 2021-09-24 16:11:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9decf50876ec9e2c8f01fdad74bcf92c SHA-1: 81c6da12817cf298972ff9f2a69a13961bc02656 SHA-256: dd173138c578c265e7541a168c89ee60c59a601d8d42cbc2ee101c592a08c917
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a phishing lure. The 'PDF_IMAGE_LURE' heuristic indicates it's an image-only document with an action trigger, typical for directing users to malicious URLs. The presence of numerous external URIs, many on disposable hosting, further supports a malicious intent, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • 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 1 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.
  • 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://drafthe.ru/uplcv?utm_term=fast+and+furious+8+yify PDF link annotation
    • https://satellietgroep.nl/userfiles/files/24882648782.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/dodipitefelikamop.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/wexevajigexefasefali.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2cce41cfd---diwigikakenawudivalib.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/vagobivi.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210924210209.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/23949479992.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/tolitid.pdfIn PDF document text
    • https://whitepalacegrill.com/userfiles/vefozenu.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/vupadosoxe.pdfIn PDF document text
    • http://opuspointpartner.com/ckfinder/userfiles/files/66326535184.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/61268575053.pdfIn PDF document text
    • https://attack.lt/images/files/67915284069.pdfIn PDF document text
    • https://www.douggoodkin.com/admin/ckfinder/userfiles/files/bofirovife.pdfIn PDF document text
    • http://alde-pace.org/ckfinder/userfiles/files/75565997274.pdfIn PDF document text
    • http://www.mmalappeenranta.com/tiedostot/files/towat.pdfIn PDF document text
    • https://sinarlangit1.com/contents/files/75082793339.pdfIn PDF document text
    • http://musik-fachberatung-neumarkt.de/images/uploadedimages/file/5158257433.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109181913553147.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210904165917.pdfIn PDF document text
    • http://ihanzao.com/userfiles/file/20210908052955_744517659.pdfIn PDF document text
    • http://ellissi.org/userfiles/files/nomamafiminav.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/31976440707.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/65542274721.pdfIn PDF document text
    • https://edinburghpools.com/contents/files/muwovodisal.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_off0000adf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADF5 14632 bytes
SHA-256: 31c0cd97139d686cd62bae4adc54c96163646191cd1c9b6523833b6a8f0117b3
font_01_sfnt_off0000d1fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA14 10568 bytes
SHA-256: f8126d1395ab1e4edc8df30e76320508634afa5c3b890ddd2fbf63794458a58a