Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b2a7db0a2950ed4…

MALICIOUS

PDF

84.7 KB Created: 2021-09-17 11:32:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 97e43f0ed12299ade170cec23917f745 SHA-1: 5a737137fa15149a04c533e7bb837cb48720a9ce SHA-256: 9b2a7db0a2950ed4d05b5ccf2629e29d511668f565d0eeb0cb2beecfeef6713e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. The embedded URLs, such as http://bscsaoner.in/ckfinder/userfiles/files/53384078559.pdf, likely serve as the destinations for this link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://bscsaoner.in/ckfinder/userfiles/files/53384078559.pdf In PDF document text
    • http://kangshi-you.com/uploads/files/202109080715292123.pdfIn PDF document text
    • http://80tner.netsociality.com/upload/files/dekoxebekemivubuke.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/56999294326.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/33489192668.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/laxogazoseteneradojikor.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/tugijibifirore.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613617007c4e9---77218871854.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/muberodigaguba.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/fonikemenatuzogu.pdfIn PDF document text
    • http://jsdarvin.com/files/88455645277.pdfIn PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/46527557855.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/vozuzoralipamojiwuz.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202191622219022.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/202197115194326.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/dabivawegalazonadux.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/46792722837.pdfIn PDF document text
    • https://n-tlg.com/files/file/80395695969.pdfIn PDF document text
    • https://lordoptika.hu/files/files/88950922846.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81518066900.pdfIn PDF document text
    • http://starfishdowney.com/uploads/files/bowutel.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/29991959052.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161374028586ed---jewow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=cool+tanks+2PDF 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_off0000e8d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E7 17604 bytes
SHA-256: a07fe682450e378376e4251945e97212151fd9171cbd2b817b21f4cc62c3a11b
font_02_sfnt_off00012f01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F01 10020 bytes
SHA-256: cbc58620dbea276a9d879e56ae549c6f582eb0fefe14a3c4703f1fc11e2515c8