Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4fe0996db063ccf…

MALICIOUS

PDF

75.4 KB Created: 2021-09-26 06:45:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7115594e55271a0e83daefdd95c279c4 SHA-1: cc23fe33de5c22119e120cd065aae90c809b0c5d SHA-256: c4fe0996db063ccfbe6c82a88f721142a868e054eb033c07dcb1faaf644ab95f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick users into calling a phone number, a common tactic in tech-support scams and callback phishing. Embedded JavaScript was also detected, suggesting potential for further malicious actions like downloading additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • 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://salwangurugram.com/files/razixu.pdf In PDF document text
    • http://f-okinawa.com/img/tmp/files/22489146017.pdfIn PDF document text
    • http://controlsystemco.com/cache/fck_files/file/79118680491.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/popoxidinulefigisuniva.pdfIn PDF document text
    • http://gekon.net/userfiles/file/21120241827.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139469bd5e25---79779597383.pdfIn PDF document text
    • http://unewstoday.com/task/userimages/file/lutokovuvodotovawoxokoxu.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/55512535429.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/detivakevatawubezuwowope.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/19708942815.pdfIn PDF document text
    • http://mfahk.com/upload/files/22544069106.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/27483856291.pdfIn PDF document text
    • https://cian.hr/userfiles/file/59077339877.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/22880888287.pdfIn PDF document text
    • http://hitelesen.com/userfiles/file/20641722764.pdfIn PDF document text
    • http://hzbmsj.com/images/upload/File/lexumujupixujoragifebe.pdfIn PDF document text
    • https://miraclechuppahs.com/userfiles/file/40682418732.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210920075725156.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/guzogilenixo.pdfIn PDF document text
    • https://pokereshop.cz/data/file/nabejolam.pdfIn PDF document text
    • https://mimpishiodua.com/contents/files/betevekasasiwubof.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147a44dacf07---46274043504.pdfIn PDF document text
    • http://tuyothuyluc.vn/webroot/img/files/13361697096.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/14990042589.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/19831704448.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=android+system+apps+safe+to+disable+2021PDF 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_off0000ba28.bin
f536588f33d20f95ef9e4835e8c9496e26d43d6a4fe5a8f3f8a167656e73934f
pdf-font-stream PDF embedded font (sfnt) at offset 0xBA28 19996 bytes
font_01_sfnt_off0000ee23.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE23 16792 bytes
font_02_sfnt_off0001063a.bin
213677efa895549f0cb426f68fdbb21a906da5ac86532b4d1588bc99e5dcfcb0
pdf-font-stream PDF embedded font (sfnt) at offset 0x1063A 11188 bytes