Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9a3389d201f076b…

MALICIOUS

PDF

74.1 KB Created: 2021-04-16 20:58:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 4534d03cf3c9e1d935a61c1e76b0e42b SHA-1: 59b650a0a779c3cfc21072d85bdd4cc8d44dd2d6 SHA-256: f9a3389d201f076b45c9089315b09811ec9d9edb03da1185cf0df3f763cca7c7
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://botokaw.ru/strik?utm_term=what+is+the+purpose+of+arguments+in+a+function+in+excel PDF link annotation
    • http://gafegenuwegapok.iblogger.org/bexezamej.pdfIn PDF document text
    • https://cdn.sqhk.co/legusovej/csjbjgl/maze_runner_1_film_completo_ita_streaming.pdfIn PDF document text
    • https://cdn.sqhk.co/terisuzuji/NidgdsA/67274541846.pdfIn PDF document text
    • https://cdn.sqhk.co/gituridewo/djbZUjg/xovazogiwosaxi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4e85a0c-ce6e-4c8c-a7b0-b72d3f2e0ecf/la_divina_comedia_quien_fue_el_autor.pdfIn PDF document text
    • https://62619d47-812b-4c4f-a232-aa08d86264e8.filesusr.com/ugd/6d62c1_f1f5fd6aaf1a4633b3b8a35991a0e6fa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/36cac41b-90d8-467c-8f26-5a437c18cff1/kung_fu_panda_3_not_on_netflix.pdfIn PDF document text
    • http://waxukoke.epizy.com/38256428225.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6433393c-bf63-4781-a61a-a360ed637106/6954679449.pdfIn PDF document text
    • http://xikimafelote.epizy.com/twilight_new_moon_full_movie_in_hindi_download_480p_filmyzilla.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a550f89-3c01-4cf3-994a-4162131d599d/el_libro_tibetano_de_los_muertos_frases.pdfIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/ghost_recon_breakpoint_weapons_guide.pdfIn PDF document text
    • https://59bb578d-b312-442a-858b-1a1a54b18a6c.filesusr.com/ugd/c79b1c_70bcc5d30f794880bd98b2c756f4805f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b40fc0c-eae1-4c2b-aa35-d29abdf24982/english_courses_for_adults_with_learning_disabilities.pdfIn PDF document text
    • https://54570836-76ea-4100-b78f-d1ba4c3cc0d1.filesusr.com/ugd/21ac59_57602e3ca6cd4c2198cf6e759405deba.pdf?index=trueIn PDF document text
    • http://fisumude.rf.gd/baby_onesie_pattern.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxalirudidel/swim_lane_chart_template_powerpoint.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_off0000dfae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAE 5508 bytes
SHA-256: a2990342c9ce5b3401e3dd552230a3bfaf5af7b3deae084dc7e007a68be95f5d
font_01_sfnt_off0000f257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF257 11276 bytes
SHA-256: cf7a0af788d9cf7dd1916f4d955305ec1e43754499d5ded01ee17ab8e6a8e1f4

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