Malicious PDF — malware analysis report

Static analysis result for SHA-256 c56a0d47fdfb7ac8…

MALICIOUS

PDF

77.9 KB Created: 2021-02-15 09:39:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 9078b4b32e57814f36a66e82ad99326c SHA-1: c6693d8fbd75b26b31cba4f4180740f9fcb45d67 SHA-256: c56a0d47fdfb7ac805165abb5bfa3248a533fabe64c2ecc40c6a020a5dee6149
192 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The heuristic 'SE_URGENCY_LURE' suggests the document body, though heavily obfuscated, likely contains text designed to prompt immediate user action, such as clicking the malicious link.

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
  • 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/aws?utm_term=lumosity+brain-+training+app+free+to In PDF document text
    • https://cdn.sqhk.co/buzomesil/ibrOghH/22846193296.pdfIn PDF document text
    • http://present-mag.ru/grand_prison_escape_3dhjym3.pdfIn PDF document text
    • http://flylovel.com/29876339003kzr5.pdfIn PDF document text
    • http://copyrightsupportforlnstagram.com/57852969920hnl5y.pdfIn PDF document text
    • http://infonewstravel.com/download_looking_for_alaskatpy58.pdfIn PDF document text
    • http://nazhivy.net/3775796601nonco.pdfIn PDF document text
    • http://wowunoli.22web.org/58478057253.pdfIn PDF document text
    • https://cdn.sqhk.co/mikevoponage/ciiLhat/65640588049.pdfIn PDF document text
    • http://paruweropu.iblogger.org/sizinawono.pdfIn PDF document text
    • http://filmera.ru/28499517465lt2g.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://funogexux.rf.gd/anrufe_sperren_android.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/pugevopoguf.pdfIn PDF document text
    • http://tupemovon.rf.gd/zikulufitomazuwusula.pdfIn PDF document text
    • http://jobifizokugo.rf.gd/adda52_live_apk.pdfIn PDF document text
    • http://safatagikev.rf.gd/97110306996.pdfIn PDF document text
    • http://gurevetafajes.epizy.com/dulifomigupibewanu.pdfIn PDF document text
    • https://s3.amazonaws.com/levumoduf/boolean_algebra_objective_questions_and_answers.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B8 5284 bytes
SHA-256: 2791abaf7303af6b8e57bc6481d1d1e63a31fdbe19a9fdfbf9e3ddf513e95079
font_01_sfnt_off0000f6ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AB 10996 bytes
SHA-256: 74b6300c0a2d856e67441e6827b4f05ae7fc3b70d779b1e08b084484de2c8305
font_02_sfnt_off00011c09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C09 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34