Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e736f10ad10d8a8…

MALICIOUS

PDF

67.0 KB Created: 2021-02-21 05:58:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7cb413dc09061c9afb0604d68ae35d7f SHA-1: bba0bb5f01fa1c103cb5034bc369ab09add8ac98 SHA-256: 4e736f10ad10d8a88fb0b69544d1c44a8322ec97561bf29dae02e8f9b7244b65
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to be a lure for academic content, suggesting a phishing or scam attempt. The presence of numerous links on disposable hosting further supports a malicious intent to redirect users to potentially harmful sites.

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=principles+of+athletic+training+15th+edition+pdf In PDF document text
    • https://cdn.sqhk.co/diratukuz/hjjghjU/nixabopugiziwipawusilot.pdfIn PDF document text
    • http://reduslimitalia-oficial.site/erase_android_device_managerlsj1v.pdfIn PDF document text
    • https://cdn.sqhk.co/zamokaxu/edig4HC/como_usar_uber_conductor_chile.pdfIn PDF document text
    • http://cooldomen.space/9831981980a9x6i.pdfIn PDF document text
    • http://ryukzak.digital/analisis_de_mallas_en_corriente_alternaj7ras.pdfIn PDF document text
    • http://ubsvp.com/college_football_game_score_predictions_bleacher_reporthgfbe.pdfIn PDF document text
    • https://cdn.sqhk.co/fiporalisu/ghcXHjg/reversibility_definition_ap_psychology.pdfIn PDF document text
    • http://all-system7.club/xaduroromeaw728.pdfIn PDF document text
    • https://kifajiziwezu.weebly.com/uploads/1/3/2/7/132740821/taruf-bovixiwox-nuwize-papifi.pdfIn PDF document text
    • http://sollabs.xyz/tafuxozariagj32.pdfIn PDF document text
    • http://nikecortez.net/580665643298cmpz.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/mefovu/97061075285.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/reticular_formation_is_damaged.pdfIn PDF document text
    • http://nagukubuliduz.rf.gd/quran_surah_names_with_meaning_in_urdu.pdfIn PDF document text
    • https://s3.amazonaws.com/jowutoneranemuk/lenovo_y50-_70_service_guide.pdfIn PDF document text
    • http://noporotosodapo.epizy.com/junior_internal_audit_jobs_in_johannesburg.pdfIn PDF document text
    • http://kajufikuxididon.rf.gd/nitrogen_in_agricultural_systems.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_off0000c81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC81E 5596 bytes
SHA-256: b926aa3c0c95382930662dfc9f5713bd90e1f9db1070faf26fe9534d6de20aeb
font_01_sfnt_off0000db25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB25 10260 bytes
SHA-256: b2634f9168798c730993efc7d6db5d54ae95e88981f7104ccda828a0d0385ead

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