Malicious PDF — malware analysis report

Static analysis result for SHA-256 efdad104c6f42541…

MALICIOUS

PDF

68.8 KB Created: 2021-03-02 10:21:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 0ea52099f571a9532818ec76b5900bd1 SHA-1: e10748506845dd9f7457f36dc2ad173543ee21ff SHA-256: efdad104c6f42541bc4c40b61fad93bac9d4fc0ce189d97be3a651fcb330148a
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the presence of malicious links and the document's structure suggest it's designed to lure users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=what+is+media+definition+in+urdu In PDF document text
    • http://emirofficialzm.com/58832850873520nt.pdfIn PDF document text
    • http://flowerport.store/gun_builder_3d_simulator_mod_apk_android_1oc6m1.pdfIn PDF document text
    • https://zepinimokibe.weebly.com/uploads/1/3/4/3/134373719/lamoleviro_vopowonu_dogosujeniseme.pdfIn PDF document text
    • http://form-lnstagramcopyrightservice.com/tapuvidoxogutuvazofen4t45a.pdfIn PDF document text
    • http://rasprodavaika.ru/bagetab5jjol.pdfIn PDF document text
    • https://cdn.sqhk.co/gusiloxi/ihhh72m/17189944529.pdfIn PDF document text
    • http://7evenrp.ru/facebook_patlatma_program_indir_gezginlerdhq4t.pdfIn PDF document text
    • https://cdn.sqhk.co/setuboluraje/jjCFVms/knighted_meaning_in_tamil.pdfIn PDF document text
    • https://jekaboda.weebly.com/uploads/1/3/5/3/135398795/1188996.pdfIn PDF document text
    • https://jaluvipuruwagub.weebly.com/uploads/1/3/4/7/134734890/4527484.pdfIn PDF document text
    • http://mscgis.net/watch_series_westworldakglv.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/jipowumat/google_chrome_latest_version.pdfIn PDF document text
    • https://s3.amazonaws.com/mixanaz/english_8_teaching_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/street_fighter_cartoon_movie.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_off0000d2c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C3 5128 bytes
SHA-256: ae8aee0e99e071a08dbf0eb7a0a3ae77f4767d4dd9b22421edb885608a1b7d93
font_01_sfnt_off0000e411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE411 9888 bytes
SHA-256: 9e19f3706d8acbd1d10252f1ba49468478fd9a1c5bec207a2afd5da997d1cb24

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