Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f9177ca24d75165…

MALICIOUS

PDF

78.1 KB Created: 2021-09-13 02:20:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: fb9cc37abb0e78351b8300ee2d04249a SHA-1: 9db1633f18f3837f5b1105e983560c04ede38b2f SHA-256: 6f9177ca24d75165b32c4431745e2adc5c1ccebd379f8f344291b103c66cc591
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick users into calling a phone number, a common tactic in phishing and tech-support scams. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to host malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://wecareu.net/ckfinder/userfiles/files/4390597658.pdf In PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/wojodonomufev.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/68108754455.pdfIn PDF document text
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/1357200442.pdfIn PDF document text
    • https://digiconelectronics.com/media/lawegipole.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/22716576180.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/30103762724.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog/file/13287653195.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/41642581933.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/xomepaditerexitukufafuw.pdfIn PDF document text
    • https://kolegium.inaheart.org/upload/files/nigomisowolag.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/nerujobuvolubunegajonag.pdfIn PDF document text
    • http://arcadia-fitness.es/userfiles/file/muwewaxibazi.pdfIn PDF document text
    • https://haruhonpo.com/upload/haruhonpo/files/tunanetazuwaxid.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/154580aa8bf1ee55b54fa21b4c5c7d30/bilakakegipifinorufumawa.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/wofuvawefajifabavutogeba.pdfIn PDF document text
    • http://luijkzonwering.nl/image/file/64951529381.pdfIn PDF document text
    • http://lukinserv.hu/file/91922309973.pdfIn PDF document text
    • http://jodhpurheritagewalk.com/images/file/xobux.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/lirikarebiritero.pdfIn PDF document text
    • https://taumed.kz/upload/2021/09files/2109062204146941821f2ag.pdfIn PDF document text
    • http://precisao.org/files/files/pokuz.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/u9emmk5bf8k3h5s01kq9t9fq6i/majizejilu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=golden+knights+martial+artsPDF 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_off0000cae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE4 10824 bytes
SHA-256: a3a3318f184de71b23503dd4f759ad0a7fc17d2245e8f83df65365c65d62cf49
font_01_sfnt_off0000e36f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36F 18308 bytes
SHA-256: bc8006051ea6714793c059cdc49dbd44ba5f9409dad7d0a18cb6bd7f2cf29387
font_02_sfnt_off00011282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11282 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1