Malicious PDF — malware analysis report

Static analysis result for SHA-256 688b123ec0ef509f…

MALICIOUS

PDF

79.2 KB Created: 2021-02-28 11:42:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 10343a7625b6e3e4fd0c32f815b1f900 SHA-1: 8079fbe096271afeea44ca0aee387bd6309cc93d SHA-256: 688b123ec0ef509fd42d0869cdbd5c97cb8de76202d63ed95df199fcfe5bf1e4
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm and a callback phishing lure, prompting users to call a phone number in a context of billing or security issues. The embedded URL 'https://resalured.ru/strik?utm_term=mississippi+driver%2527s+license+status' suggests a phishing attempt related to driver's licenses.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/strik?utm_term=mississippi+driver%2527s+license+status PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370560/normal_6011308953966.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406241/normal_5fd9aad629bb1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480389/normal_602b47b0836d1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480753/normal_5ffc34216a316.pdfIn PDF document text
    • http://stavki-na-sport.site/tesemosapipefepll9ls.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412996/normal_5fff0a01460ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418991/normal_6035dedce0955.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369935/normal_602f40509dadc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493610/normal_60004e4b89462.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479705/normal_601ab74442fb0.pdfIn PDF document text
    • http://zuzimosutikume.22web.org/24795388900.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sojoramuf.epizy.com/septic_arthritis_pediatric_guidelines.pdfIn PDF document text
    • http://zumaruzafomadik.rf.gd/kodoteguludanovajinix.pdfIn PDF document text
    • http://zisoramemib.rf.gd/physics_syllabus_for_bsc_1st_year.pdfIn PDF document text
    • http://sutexuvidag.myartsonline.com/9767470086.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://scripts.sil.org/OFLIn 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_off0000e3d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D1 5164 bytes
SHA-256: dc97e22574a4023d77340eb1758944bf63b739d33067d0a75ec28f2e31e5a15e
font_01_sfnt_off0000f58c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58C 10528 bytes
SHA-256: a71e710a634c542e6a9d911db49961d97d708ff1f0a5a918c8b52970fb240df8
font_02_sfnt_off000119f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F1 16164 bytes
SHA-256: e296a61d2d303e35be9e1a35631556663d2780498efa7e8f3867bf557f172fe6

Open this report in the interactive analyzer, or submit your own file for analysis.