Malicious PDF — malware analysis report

Static analysis result for SHA-256 e785b5a500419700…

MALICIOUS

PDF

76.0 KB Created: 2021-03-01 09:46:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 00b9787930816c9e8c953b223ff64efd SHA-1: aa65c8b6a19d493ff5dc512edbdedd5fa8607e33 SHA-256: e785b5a500419700f80e1b91e0be4b11ddcb68cda6c3cf245c995195a7b2d296
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains metadata related to PDF generation and keywords that might be used for SEO manipulation to attract victims.

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
  • 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://kuzutuzo.ru/wb?keyword=best%20dog%20foods%20without%20grain PDF link annotation
    • http://toportt.online/rusuxofunatemujanidc58aa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413575/normal_60092475b93b8.pdfIn PDF document text
    • https://bepizapumi.weebly.com/uploads/1/3/5/3/135349865/tilud_xujozafojogob.pdfIn PDF document text
    • https://zepinimokibe.weebly.com/uploads/1/3/4/3/134373719/6b4afc31dc2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374851/normal_5fdd334f7c969.pdfIn PDF document text
    • https://kajizifobizixa.weebly.com/uploads/1/3/3/9/133997117/1988e7e.pdfIn PDF document text
    • http://kleomaften.online/bubidolibepaxotibidowa78zmx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479240/normal_602147dac0ecf.pdfIn PDF document text
    • http://pejagepelif.iblogger.org/30887880851.pdfIn PDF document text
    • http://wapuwesifatirok.iblogger.org/smartparts_digital_picture_frame_wont_turn_on.pdfIn PDF document text
    • http://tolejif.22web.org/i_don_t_care_lyrics_ed_justin.pdfIn PDF document text
    • http://nivulegojin.iblogger.org/vovorixepenus.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://zudajuwi.epizy.com/animated_background_for_powerpoint_free.pdfIn PDF document text
    • https://s3.amazonaws.com/boduxatavepe/baal_veer_1114.pdfIn PDF document text
    • https://s3.amazonaws.com/datarofapakil/vivaldi_italic_font.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_off0000ddb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB7 5160 bytes
SHA-256: 5c88566b9b11a31aa5260239611454a1d7f729c53e6af33a2ee7ae2cd5ad450b
font_01_sfnt_off0000ef4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4B 10876 bytes
SHA-256: 0d74f32af853f49fe580fd240740d05453d5f5c31cf29006f89dc83714f3e9b1
font_02_sfnt_off00011486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11486 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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