Malicious PDF — malware analysis report

Static analysis result for SHA-256 996e1af528f96884…

MALICIOUS

PDF

78.4 KB Created: 2021-03-01 13:56:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 3b2d81192a61ee1342cd2047644c1597 SHA-1: 5ae21418d88526d9728de381cc073b789a17ee95 SHA-256: 996e1af528f96884a41e211870e4378608cec94a70d46b064a23e42dbdd5f4bf
184 Risk Score

Malware Insights

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

The PDF contains numerous links to disposable domains and known malicious redirectors, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. While no scripts were extracted, the embedded URLs are the primary indicators of malicious intent, likely serving as a lure for further compromise.

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://dafemum.ru/award?keyword=braun+wheelchair+lift+parts+diagram In PDF document text
    • https://cdn.sqhk.co/bodorosuzuta/q3zhbji/merge_td_idle_tower_defense_mod_apk.pdfIn PDF document text
    • http://bumasujofoj.getenjoyment.net/xelofupugo.pdfIn PDF document text
    • https://murasujudadalox.weebly.com/uploads/1/3/5/3/135338307/kalakiwadifi.pdfIn PDF document text
    • http://biwejobezimije.22web.org/english-_french_dictionary_larousse_apk.pdfIn PDF document text
    • http://lomigakorak.getenjoyment.net/kemoxosetimujudaxobaja.pdfIn PDF document text
    • https://fixajunize.weebly.com/uploads/1/3/6/0/136051507/wikilizi.pdfIn PDF document text
    • http://fulusixavopowem.iblogger.org/rikapavebu.pdfIn PDF document text
    • https://vitafidazi.weebly.com/uploads/1/3/4/7/134728623/ginenisurerusijuv.pdfIn PDF document text
    • http://fanisore.sportsontheweb.net/axiom_pro_49_power_supply.pdfIn PDF document text
    • http://sevowina.medianewsonline.com/1063903669.pdfIn PDF document text
    • http://nuloriwilorij.scienceontheweb.net/gizijiwubobako.pdfIn PDF document text
    • http://fejukoturig.medianewsonline.com/language_development_an_introduction_9th_edition.pdfIn PDF document text
    • https://cdn.sqhk.co/bovutolomevo/dgglRii/jasuvojujitogogurujuw.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://kujewawazereki.rf.gd/boxikerupaxizo.pdfIn PDF document text
    • http://xinifaduzinuvu.onlinewebshop.net/instrumentos_recoleccion_de_datos_estadisticos.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_off0000dfb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB1 5484 bytes
SHA-256: 3203dc9f58ccccc8b8f544c82454ef0aa3eadb042906687896e91ebcf9ff833a
font_01_sfnt_off0000f235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF235 14428 bytes
SHA-256: 79f179ce44e0fc1ecbf900db4b1a6e33d0ec3cea2c44111214e1c4782415fe8e
font_02_sfnt_off00011ea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA6 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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