Malicious PDF — malware analysis report

Static analysis result for SHA-256 e27adb490b701380…

MALICIOUS

PDF

98.4 KB Created: 2021-09-11 22:29:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b4ae2f6b96180ea043856c18eef2df62 SHA-1: b62ae0231969d9e77a53ed2d67af28daeff2b79c SHA-256: e27adb490b70138002d34580f7fd11ca2a63133e378c6294e6ac2db83dade0ff
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of embedded URLs pointing to various domains, with a specific heuristic identifying it as a link farm on disposable hosting. This suggests the primary purpose is to lure users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613841f0c39e4---19185145103.pdf In PDF document text
    • http://hasadtemizlik.com/upload/file/suwami.pdfIn PDF document text
    • http://flirdining.com/uploads/files/964411549.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/tavet.pdfIn PDF document text
    • http://smalternatywa.pl/media/upload/files/8680164158a936a9d2bbe8b26b53ff2b.pdfIn PDF document text
    • https://12shio4.com/contents/files/42145492865.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/52337097021.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210901_561F7F2366342EEA.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/36847716217.pdfIn PDF document text
    • https://haidangpc.com/contents/files/nafapemoxavidiwanuvepi.pdfIn PDF document text
    • https://alcc.c-zentrix.com/ALCC/mail_attachments/multitenant-ws-01/1/1630766731.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/44414846494.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/293054582.pdfIn PDF document text
    • http://srcchaika.ru/files/uploads/files/20055054101.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/38387795040.pdfIn PDF document text
    • http://dreamsurgerycn.com/ckupload/files/5430521464.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/61166159303.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/sogekugasenakijeroda.pdfIn PDF document text
    • https://umartravel.com/files/57984092830.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/japetezomagexoke.pdfIn PDF document text
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/4432410708.pdfIn PDF document text
    • http://taemyung.com/data/upload/file/21203188717.pdfIn PDF document text
    • http://ebus.cn/up_file/file/nowiduputobo.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/56691999827.pdfIn PDF document text
    • http://sipzip.com/userfiles/file/puzanawexesi.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/73449183584.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=chal+mera+putt+2+movie+onlinePDF 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_off00011929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11929 10664 bytes
SHA-256: c065b1d17adf922bd4709e259f83e44ba0bc6c4938bf6bec6a92ca72d31afd92
font_01_sfnt_off00013169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13169 19032 bytes
SHA-256: 089349c38be52fb463857826ecb347612d3d9a5521e69d842aa8e9476df06c0c
font_02_sfnt_off000163c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1