Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5eb1fa520f8101d…

MALICIOUS

PDF

67.1 KB Created: 2021-02-12 08:38:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3a692b1e6cdca6ffbc0613ea18c0c4db SHA-1: 243dcd9109bafac740d3c0df3048f89bf1e0b91e SHA-256: e5eb1fa520f8101d99b9857e39590f54159474af3e22f045564ddf96fcca145f
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to disposable domains and are flagged as malicious redirectors. The document body, though heavily obfuscated, appears to be a lure for downloading a PDF, aligning with phishing tactics. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a phishing or malware distribution site.

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://yafferge.ru/wix?keyword=biopsychology+pinel+10th+edition+pdf+free+download In PDF document text
    • https://static.s123-cdn-static.com/uploads/4369776/normal_5feec6ebe87dc.pdfIn PDF document text
    • http://twoup-viktoria.online/xorotofulixajinibubutxrua4.pdfIn PDF document text
    • https://cdn.sqhk.co/timadupak/jbg66Kt/maps_navigate_and_explore_vs_maps_go.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476142/normal_5fcd1795c1556.pdfIn PDF document text
    • http://hookup750.website/xifiwumavujigx0dx.pdfIn PDF document text
    • https://cdn.sqhk.co/sugezigo/ZsGyV2D/saxexowudomo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477387/normal_5fd81afa27a93.pdfIn PDF document text
    • https://cdn.sqhk.co/gutipefu/8DahcHk/kimegug.pdfIn PDF document text
    • http://microbladingcertificationdfw.org/rimuovere_aggiornamenti_app_androidxwdm8.pdfIn PDF document text
    • http://noriwisisun.iblogger.org/ropexewulew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393022/normal_60168c57552b2.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://lajinijes.rf.gd/naguga.pdfIn PDF document text
    • http://vixugow.epizy.com/brilliant_legacy_480p_sub_indo.pdfIn PDF document text
    • http://dajejat.rf.gd/krishna_wallpaper_hd_for_android_mobile.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_off0000ba56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA56 5644 bytes
SHA-256: 4af93fe867a3b4fbed1e97b51466a47dbe19d51dfbd729fa58dc9bfb14dbcccc
font_01_sfnt_off0000cd9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD9C 10336 bytes
SHA-256: d755f42fd1baebac83e8cbf38dfd33392ecc1ea938acbfd836c385e1429623bb
font_02_sfnt_off0000f10d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10D 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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