Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcb784686e3893de…

MALICIOUS

PDF

74.0 KB Created: 2021-01-18 23:23:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 637fda65d5b27391b0a77657a883280e SHA-1: 3538220a5bc75ccc47714f3641aac091875063fb SHA-256: dcb784686e3893de9bd3e930d28ce79fa198bfcd184a5199f08c516643001b5f
126 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan distribution attempt. It contains a large number of embedded URLs pointing to various domains, many of which appear to be disposable or link farms, suggesting a coordinated effort to redirect users to potentially harmful content. While no scripts were explicitly extracted, the presence of numerous external URIs and the overall structure strongly indicate a phishing or malware delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffe.ru/123?utm_term=is+there+an+age+limit+to+buy+condoms+in+india PDF link annotation
    • https://site-1177369.mozfiles.com/files/1177369/mcdonalds_breakfast_hours_on_weekends.pdfIn PDF document text
    • https://cdn.sqhk.co/perigupa/VxzLLYR/38258542057.pdfIn PDF document text
    • https://site-1172118.mozfiles.com/files/1172118/daoc_classic_alchemy_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414687/normal_5fb5000e436ae.pdfIn PDF document text
    • https://site-1228309.mozfiles.com/files/1228309/nuzozeguwazapapo.pdfIn PDF document text
    • https://site-1168485.mozfiles.com/files/1168485/54907506495.pdfIn PDF document text
    • https://site-1175696.mozfiles.com/files/1175696/zelidajurikibab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503787/normal_5fc6097295b98.pdfIn PDF document text
    • https://site-1166601.mozfiles.com/files/1166601/roblox_free_robux_hack_2019.pdfIn PDF document text
    • https://site-1213938.mozfiles.com/files/1213938/mokufutipetirobatominidos.pdfIn PDF document text
    • https://site-1178807.mozfiles.com/files/1178807/gafitemuvopudu.pdfIn PDF document text
    • https://site-1248228.mozfiles.com/files/1248228/barnsley_sixth_form_college_moodle.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444636/normal_5fb7b7d26ba29.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473892/normal_5fe2a50ab84ff.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B3 5532 bytes
SHA-256: d0d2decd75b737a38933c282e43f1ad72b1205cfcc6b6dd8cb2ddb92bd073d08
font_01_sfnt_off0000f75e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75E 10420 bytes
SHA-256: 3355c7559f2a87b190635b4f17fab548fd0838de0c4bd11133a42d13d59cd92c

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