Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0cc260cb5df1079…

MALICIOUS

PDF

78.3 KB Created: 2021-03-14 23:50:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 31b44b0d76416b2d5e42e99881699a9c SHA-1: 99b5f370f0b6c8a77e7a76d742232a03dfc21e41 SHA-256: f0cc260cb5df1079ec361c8a4d21bcf3b83396540345d03ad79680c9044e499d
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one identified as a malicious redirector. The document body, though heavily obfuscated, appears to contain keywords related to academic calendars, suggesting a lure to disguise the malicious intent. The presence of multiple disposable hosting links further supports a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=shoreline+community+college+academic+calendar+2020 In PDF document text
    • https://static.s123-cdn-static.com/uploads/4411931/normal_5ffcd406328b6.pdfIn PDF document text
    • https://cdn.sqhk.co/gisepavuv/lSlYhcM/lock_screen_iphone_7_apk.pdfIn PDF document text
    • http://about-central.com/71754406729mkr2h.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456999/normal_6011808ac422d.pdfIn PDF document text
    • http://discount50.pro/cisco_dpc3010_docsis_3.0_cable_modem_default_login65ywf.pdfIn PDF document text
    • http://begetus11ppz.xyz/25411595452k6pky.pdfIn PDF document text
    • http://milanomoda.site/chance_would_be_a_fine_thing_synonymzqg8b.pdfIn PDF document text
    • http://ecosbor.net/sindrome_de_ulises_libro7gk3t.pdfIn PDF document text
    • http://datingsexchat.site/samsung_android_tv_malaysiacgenv.pdfIn PDF document text
    • http://politach.com/jerurumluz.pdfIn PDF document text
    • https://cdn.sqhk.co/kinemefuwa/ghhaigX/tropico_4_vs_5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451206/normal_5fdbbb3710a0b.pdfIn PDF document text
    • https://cdn.sqhk.co/wumidimux/gfp4X5y/namasifim.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f110cc6a-49d6-427c-9ab6-a3a4d323b004.filesusr.com/ugd/9e53d4_4a5371f2fe0b4c1996b140285480c571.pdf?index=trueIn PDF document text
    • https://1a2149e7-ca7f-4e7c-a584-0e483de6f3af.filesusr.com/ugd/9219f8_e51c9c5e990a4a24971e541a347babe0.pdf?index=trueIn 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_off0000f3f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F8 5652 bytes
SHA-256: d6bb7b03d8987200f11f4a9298c7176ce1fa3c85c77288d71f7d76bf34e3e3c0
font_01_sfnt_off00010712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10712 10764 bytes
SHA-256: ec8ce8217bac9fcb04196bfc7579d252b97dcfaadde7c210749a36118c5701bf

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