Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd6b8d9e5fd505f3…

MALICIOUS

PDF

64.4 KB Created: 2021-02-22 14:06:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9216ffc6295ddeab8193930a3e074854 SHA-1: 2030cc9c94b650b7cb196af07c363a648c5e3ab3 SHA-256: dd6b8d9e5fd505f37671820206e51d3d0d87e70d16cdd4d2012c92c173b39473
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, indicative of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to malicious content, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://bologen.ru/wix?keyword=the+treasure+of+lemon+brown+test+pdf PDF link annotation
    • http://vazosuzited.22web.org/59980845754.pdfIn PDF document text
    • https://cdn.sqhk.co/giripiponi/xiebgGi/xopamopukufikusewinegen.pdfIn PDF document text
    • https://lorotorerusut.weebly.com/uploads/1/3/1/4/131452969/mamugelewerunu.pdfIn PDF document text
    • https://dikekivex.weebly.com/uploads/1/3/0/7/130775400/sazogafasej.pdfIn PDF document text
    • https://cdn.sqhk.co/wepiwojeta/oGhajgi/ice_beauty_queen_makeover_2019.pdfIn PDF document text
    • https://zorisurirumu.weebly.com/uploads/1/3/4/6/134600588/fomuvejatanudose.pdfIn PDF document text
    • https://cdn.sqhk.co/zidexamuwela/jbgejdZ/keep_my_notes_backup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447878/normal_602d789ed081b.pdfIn PDF document text
    • http://sellforce.ru/histoire_christianisme_en_afriquefwaud.pdfIn PDF document text
    • https://cdn.sqhk.co/ributexovek/adThceo/galaxy_air_force_war_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/sadoburola/yP9hdih/drop_it_meme_fnaf.pdfIn PDF document text
    • http://zuvels.xyz/respiratory_system_parts_and_function_worksheet28fj1.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/sixenogafopoj/77002299757.pdfIn PDF document text
    • http://puwojewemuxa.epizy.com/29268156121.pdfIn PDF document text
    • http://sozogakuvigoxev.epizy.com/lilifukekujiberapuj.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_off0000c177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC177 5460 bytes
SHA-256: d76825e8711f7823341643b1d5ed8bef9f82d97a2e9044229357bd39a16c2b4a
font_01_sfnt_off0000d3e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E5 9628 bytes
SHA-256: 17b1fb845675bc3df5e01a6e277787cde99387f3e8acff9c70071e6fde34d273

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