Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ae07f51e7080893…

MALICIOUS

PDF

67.0 KB Created: 2021-02-07 14:39:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 50b527db5a77d07efbcbe1e274bc7330 SHA-1: 3be21387e6531fbbccde2afb710459b448318699 SHA-256: 4ae07f51e7080893781fb1b58d80481f91840bf369e3714403c1ff5a42416ba6
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 identified as a redirector to known malicious infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains fragments that may relate to the embedded links, suggesting a lure for phishing or malware delivery.

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/123?utm_term=collide+howie+day+chords In PDF document text
    • https://cdn.sqhk.co/lugizumevemu/hcj0qtG/43546661910.pdfIn PDF document text
    • https://cdn.sqhk.co/movozuba/idvhjdM/7682773087.pdfIn PDF document text
    • http://godomun.iblogger.org/chammak_challo_chail_chabila_song.pdfIn PDF document text
    • https://cdn.sqhk.co/gexedamej/hiZEjgi/remufasawupuvafetupipuwag.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bijaxufima.epizy.com/grammar_chomsky_normal_form.pdfIn PDF document text
    • http://wokobunowome.epizy.com/accountant_report_rules_malaysia.pdfIn PDF document text
    • http://pefogitoveni.epizy.com/fujunusebatewesukuzev.pdfIn PDF document text
    • http://tafikepuvanotu.epizy.com/java_string_format_array_values.pdfIn PDF document text
    • http://nisuzadusidu.epizy.com/after_effects_transition_presets_free.pdfIn PDF document text
    • http://soxalisaxofaba.epizy.com/39182283909.pdfIn PDF document text
    • http://vamivesuger.epizy.com/7523682966.pdfIn PDF document text
    • http://xifabemifuxiza.rf.gd/etl_technical_specification_document_template.pdfIn PDF document text
    • http://pufovipejofag.epizy.com/brahma_kumaris_meditation_music_instrumental.pdfIn PDF document text
    • http://gobonelore.epizy.com/exercice_amortissement_dgressif.pdfIn PDF document text
    • http://tefabawamibane.epizy.com/nemenuma.pdfIn PDF document text
    • http://guruwemuzotal.epizy.com/world_of_warcraft_auction_house_app_android.pdfIn PDF document text
    • http://bolutiso.epizy.com/8353668569.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_off0000ca1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA1A 5128 bytes
SHA-256: 2537d9708404e2258e03a27ffa8e437e09c3b553b20b15382ddcfd59260d67a6
font_01_sfnt_off0000db93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB93 10536 bytes
SHA-256: b0d4a7f00794dd47bc374287d1c00f7331cb5c24234ffe343e0e84254579009f