Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e5b10ec82308166…

MALICIOUS

PDF

78.2 KB Created: 2021-04-06 07:57:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0eb7c13255c5a0dc7750064c5441213f SHA-1: f25848001e82beb8b5a0960141a3ee458ecf9a2f SHA-256: 8e5b10ec82308166a77f2a0f35d2e310ccaa8ea7e9a51e6e0060c0662490ee1b
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to 'golowaki.ru', suggesting a phishing or malware distribution attempt. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further indicates malicious intent through link manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://golowaki.ru/aws?utm_term=requirements+for+a+general+contractor+license+in+florida
    • https://cdn-cms.f-static.net/uploads/4486215/normal_5fd8cdaed607b.pdf
    • https://cdn-cms.f-static.net/uploads/4378827/normal_601e2dd2cdc7b.pdf
    • http://nokiwurugibub.mypressonline.com/apologies_that_never_came_free_download.pdf
    • https://juwalonivegab.weebly.com/uploads/1/3/5/3/135309433/3e310d6de154.pdf
    • https://levavago.weebly.com/uploads/1/3/5/3/135343263/pemedegowipufirefim.pdf
    • https://static.s123-cdn-static.com/uploads/4500911/normal_5ff8f13730f1a.pdf
    • https://pinowutofabu.weebly.com/uploads/1/3/4/7/134763632/bepifer.pdf
    • http://tebapewulodafe.getenjoyment.net/duwumuvemudep.pdf
    • http://minosijasif.mypressonline.com/diario_escritores_de_la_libertad.pdf
    • https://rukinuzozumar.weebly.com/uploads/1/3/4/0/134012371/830512.pdf
    • http://texivej.sportsontheweb.net/pekevajezejulawo.pdf
    • https://cdn-cms.f-static.net/uploads/4379387/normal_604f558ca344b.pdf
    • http://pewekelexu.mygamesonline.org/bsc_syllabus_2020.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9b117c2b-a8c4-4f96-a38a-d3994fc08d7e/58868248586.pdf
    • https://s3.amazonaws.com/figugipopar/apeman_dash_cam_c550_user_manual.pdf
    • https://s3.amazonaws.com/dudigonifu/megumego.pdf
    • https://5e024257-ca51-40df-b6b5-a3104c7b7124.filesusr.com/ugd/97368a_df98e586aa77447790ec35f551a4120a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7efb19ce-ac6f-4145-a86c-68eccd29e4b7/how_does_nike_produce_its_products.pdf
    • https://uploads.strikinglycdn.com/files/3c7eabe9-dc72-43e2-83e6-ee9d917d3362/mulasifevobevoluripu.pdf
    • https://s3.amazonaws.com/juzewojavomofew/4540783863.pdf
    • https://s3.amazonaws.com/toliwudalamem/polutigutetun.pdf
    • https://09d7e2b9-79a3-4876-9e00-73a1ba4263a4.filesusr.com/ugd/92fcd7_5c94fb96e9b244f4b4b5676b7bd6a1ea.pdf?index=true
    • https://s3.amazonaws.com/mivokozibu/attu_movie_tamil_hd_movie.pdf
    • https://uploads.strikinglycdn.com/files/23b6fa85-490e-4e8d-b6a8-32a416d4bcab/pofanavenameletididujovof.pdf
    • https://uploads.strikinglycdn.com/files/a05b6e88-c7ec-422c-be27-bfebd915377b/bapunivigeniwevomenijox.pdf
    • https://a0f1d9c0-ea46-4e0e-9383-d87711d3127f.filesusr.com/ugd/1e3fb7_7ddd18dc36f84d109893d70927dce2a8.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f430.bin
5af9d61959a8898249588dbafe1c4ab8deffe131d72d8b39012d0b293bc3adff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF430 5476 bytes
font_01_sfnt_off000106b4.bin
dc658ae0c3e91f04f90eb00aeda9af3973eadb84227ab58e499a9b049782b5f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106B4 10480 bytes

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