Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a8598beb54ee36b…

MALICIOUS

PDF

78.5 KB Created: 2021-03-17 10:40:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 3ea30063ea310ea0344c2ac99ea55174 SHA-1: b993a162936cd7a3f6f2f9027a7a8de4ab2c96ec SHA-256: 0a8598beb54ee36bde2c0ce3cd2ea29c24f0c710f7e734f6b43b53e05ad663f6
184 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and an ML classifier, indicating it is likely a phishing or trojan delivery mechanism. The embedded URLs and link farm structure suggest an attempt to redirect users to malicious content, potentially disguised as legitimate documents like calendars or manuals. No scripts were extracted from this sample, but the PDF structure itself is designed to facilitate malicious redirection.

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/award?keyword=ssc+calendar+2020+pdf+download In PDF document text
    • http://raisinshub.pro/samsung_xpress_m2835dw_user_manualw7a1z.pdfIn PDF document text
    • http://fozogadixanemo.iblogger.org/ctet_question_paper.pdfIn PDF document text
    • http://noksipals.online/9679428554bbmp7.pdfIn PDF document text
    • http://fodiwelamar.22web.org/the_interpretation_of_cultures_chapter_1_summary.pdfIn PDF document text
    • https://cdn.sqhk.co/xajevedu/iiIjguT/fevajawuw.pdfIn PDF document text
    • https://cdn.sqhk.co/ravusigi/iuPIjYS/dozovevabumuguw.pdfIn PDF document text
    • https://cdn.sqhk.co/liminekaj/7ehfhjt/siveturo.pdfIn PDF document text
    • http://tasefuvakol.22web.org/19054157794.pdfIn PDF document text
    • http://kakasusalulul.iblogger.org/vometatop.pdfIn PDF document text
    • http://gemobaraza.iblogger.org/formato_para_certificado_medico_imss.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lakugakukilub.rf.gd/70331749050.pdfIn PDF document text
    • http://puwagof.rf.gd/70278459897.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/384bdaa3-7e68-4043-9948-829ba295e345/bawavusixujuvumadexetevum.pdfIn PDF document text
    • http://sijomawawu.epizy.com/wizogizamutamixowuk.pdfIn PDF document text
    • https://591e60e9-54e8-4b06-a9a7-f2e0522969d0.filesusr.com/ugd/1fd4b7_4366281e182b4bb1b28ec8fa43083e73.pdf?index=trueIn PDF document text
    • https://c7972686-9310-4d97-8ac3-15e828887225.filesusr.com/ugd/8a419d_2f19dd6593e14ad9a17e1746f15402d2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c67d6b8-a700-42b9-ba5e-bc525198eaf7/pokegowatim.pdfIn PDF document text
    • http://reditavipesef.rf.gd/72017827880.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16a7faec-4303-449c-898c-9cb4f736cfb0/ps4_date_de_sortie.pdfIn PDF document text
    • http://marojinoz.rf.gd/88293012815.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_off0000f31e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31E 5616 bytes
SHA-256: bfa77d60be138ade595452c9837d060a70cf83cfdf3aa292876254510bbb4c1e
font_01_sfnt_off0001065a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065A 11280 bytes
SHA-256: 978649fb73a87c68e44f842e41e7af912c015e2c8c8109a021c486726d28cb6e

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