Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8230d95456ece9d…

MALICIOUS

PDF

81.4 KB Created: 2021-09-13 21:18:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9e7e8da38149c1f5877631a262c430bd SHA-1: eadb787e6bbcb2d03563bedf5fb57a84dea168d0 SHA-256: a8230d95456ece9dda41468baa12e382784fd5cfd8b02f2a3c26814a41a5e946
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of a 'download button' lure and numerous external links, including one pointing to a potential malware download, suggests a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to exploit vulnerabilities or trick the user into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 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://catamma.ru/uplcv?utm_term=vidcompact+pro+apk+free+download PDF link annotation
    • https://vinniescustoms.com/userfiles/files/wikuxudupurudugowapale.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/waderubadosa.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/sifaxoxetixug.pdfIn PDF document text
    • http://proleague.dk/userfiles/file/65157230723.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16136565aefab8---badesujezari.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/7ed13e4c8d4f07b6a2fb3a2015136b4f/pamepisopibakixiv.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/82774998735.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/27822945787.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/19429570374.pdfIn PDF document text
    • https://www.food-equipment-store.com/fckeditor/uploads/file/19348674556.pdfIn PDF document text
    • https://ebooksweb.net/files/file/pijer.pdfIn PDF document text
    • https://fetogram.ir/images/upload/files/forafareziwuloxedopedul.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/89120028580.pdfIn PDF document text
    • http://modero.vn/upload/files/nigukixijuk.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090903090196983.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/67656206388.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/viwesuzajuvomujun.pdfIn PDF document text
    • https://riwg.in/userfiles/file/jedaxexejuzixarexazusu.pdfIn PDF document text
    • http://kozelsk-adm.ru/files/uploads/files/10786144018.pdfIn PDF document text
    • http://pincodehub.in/userfiles/file/sefadivegelobasagiwun.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/28733982566.pdfIn PDF document text
    • https://univerosg.com/ckfinder/userfiles/files/84862935698.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/81416817173.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/bakejakapekas.pdfIn PDF document text
    • http://888spirits.com/userfiles/file/mesitulobebusewimew.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d75f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75F 10760 bytes
SHA-256: a7e2e044795965a69f580c5d615594d7e9334b25689b3c4a99f171814a6c9e7e
font_01_sfnt_off0000f02b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001083d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083D 18416 bytes
SHA-256: 3e06df25392950a736eaa2633f85f207cd87cea3ef3545b80fac99da5e1ad8f5