Malicious PDF — malware analysis report

Static analysis result for SHA-256 31162ac5891e1fb6…

MALICIOUS

PDF

75.2 KB Created: 2021-02-16 08:41:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: a6f19031c47fb51677a0effb0f4738b9 SHA-1: 1b8f124d308b42ec4283522839eb7a7d0602eb82 SHA-256: 31162ac5891e1fb69ce024511ea4d3f30d485ddb3f9ebcdad9ca2d4298ba11c0
184 Risk Score

Malware Insights

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

The PDF contains numerous links to disposable domains, with one specifically identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites, likely for phishing or to download further malware.

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=keto+diet+recipes+book+pdf+free In PDF document text
    • http://mybiol.site/janemuwemuwetegakofadazop8pa9a.pdfIn PDF document text
    • http://bazis-rostov.com/life_insurance_buyer_s_guide5mli8.pdfIn PDF document text
    • http://salonvarna.com/puxofatusesawurzvzis.pdfIn PDF document text
    • http://brumbum2.xyz/fundamentos_de_quimica_hein_arena48srd.pdfIn PDF document text
    • http://wide-take.top/lazagugabevix77tsb.pdfIn PDF document text
    • http://visiblawty.com/kixuzivyvk7.pdfIn PDF document text
    • http://wonder-ita.space/163276460442ceam.pdfIn PDF document text
    • http://accface.in/informao_nutricional_abobora_cabotiar0v1p.pdfIn PDF document text
    • http://13millions.store/92017832060q1fim.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498971/normal_5ff5ce563997e.pdfIn PDF document text
    • https://cdn.sqhk.co/remowiwa/Fughj0F/58200143113.pdfIn PDF document text
    • http://epaytds.xyz/idle_world_earth_2._0irrdf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404105/normal_5fe4cb63344e6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492546/normal_5fe0475e449e9.pdfIn PDF document text
    • https://cdn.sqhk.co/ximepadogi/zjcigex/football_referee_jersey.pdfIn PDF document text
    • http://spoonnumberone.xyz/ocarina_music_sheets_12_hole4808v.pdfIn PDF document text
    • http://tronreserve.online/minecraft_vn_mien_phiwro8g.pdfIn PDF document text
    • http://kudretbozaci.com/fender_tone_master_twin_weightmjhut.pdfIn PDF document text
    • https://cdn.sqhk.co/jimumakevaji/cRgdXif/fiji_airways_airbus_a350_business_class.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e9db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DB 5080 bytes
SHA-256: fea07ae889bd2017a302a9d44c94ca4429bd1097c8bb394273566db077dba78a
font_01_sfnt_off0000fb31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB31 10640 bytes
SHA-256: fb501cbd3b1bc3f2d1fc4e961f66ad91df3d42397aa5f6a97f2caf47b56de65b

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