Malicious PDF — malware analysis report

Static analysis result for SHA-256 af416620aab3c65b…

MALICIOUS

PDF

71.4 KB Created: 2021-02-23 07:13:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 59911bbb59939117ced41d5a8a1d5329 SHA-1: 41917b5cdc6c8da0e612851422a8431a3d4de3e8 SHA-256: af416620aab3c65b2335804a1d425075185a1aa70960933d3885509808ff2eb7
192 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains fragments suggesting urgency, aligning with phishing lures. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a malicious site for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://yafferge.ru/strik?utm_term=trauma+narrative+chapters In PDF document text
    • http://vittorguxx.site/ample_guitar_m_lite_vstc5tfh.pdfIn PDF document text
    • https://luwiritogejoti.weebly.com/uploads/1/3/4/2/134266422/sujenefonobowoseven.pdfIn PDF document text
    • https://mikugixu.weebly.com/uploads/1/3/1/4/131438693/1835960.pdfIn PDF document text
    • http://hotsales-com.xyz/88_the_narrow_roadowrcn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476007/normal_5fe45e0768a95.pdfIn PDF document text
    • http://gonuzigodu.iblogger.org/70413530581.pdfIn PDF document text
    • http://mastera-saydinga.ru/pathophysiology_of_cholesterol_gallstone_formationheyob.pdfIn PDF document text
    • http://nunokitatamipo.22web.org/60420250299.pdfIn PDF document text
    • http://socialwave.me/672044618233aaxz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/feliso/australian_modified_karnofsky_performance_scale.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/67468525178.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA7 5152 bytes
SHA-256: da4b720e5b382103b7637267a0ca81fd6d9bfdeb87814ebf3447a487deb0bac6
font_01_sfnt_off0000ed04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED04 10448 bytes
SHA-256: 4e0e97e8c68277a2fc4cd61717b34eecc76d770fde783319e73e67ced4457c37

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