Malicious PDF — malware analysis report

Static analysis result for SHA-256 8af55206b91fc7b1…

MALICIOUS

PDF

82.9 KB Created: 2021-09-10 05:02:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ce37a459205cb3170358df173a31f45e SHA-1: 2a8c2cae25261de611b69a70a3040efb1dc7169c SHA-256: 8af55206b91fc7b1c125a567530f53eba25321af267c468e0836ee565da26a59
134 Risk Score

Malware Insights

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

The file is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier with high confidence. It contains numerous embedded links, many pointing to disposable hosting, and a heuristic indicates a deceptive download button lure. The presence of these elements suggests the document is designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://samuelben-horin.com/userfiles/file/roxujunabuwo.pdf In PDF document text
    • http://ktcz.eu/files/files/risaxelapawewofewolulogo.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/jekirekisixigobalu.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/lomunomineru.pdfIn PDF document text
    • https://umiyawoodworks.com/fckdb/userfiles/file/38311156288.pdfIn PDF document text
    • http://xmst.com.vn/app/webroot/uploads/files/sanizetusegafatadet.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/binopisevononimun.pdfIn PDF document text
    • https://maconlux.ovh/userfiles/files/tipakefutezasur.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/repat.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/fonaxan.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/zojiwitobujoruperutasa.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/xazesewajebitidun.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/67385135337.pdfIn PDF document text
    • https://zlataraburmevuckovic.com/files/17747295848.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/bakitaxadibebizegesedo.pdfIn PDF document text
    • http://www.beverburcht.nl/upload/files/vipafaxubaxuzuxovaze.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/33020268465.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/41026172856.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/78525564852.pdfIn PDF document text
    • http://aurora-c.jp/files/files/mizejopojipaderakasujewo.pdfIn PDF document text
    • http://greenglobepms.com/uploads/nirexez.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/13280738023.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/9qkae0j0lh7mpim9qo0jqjoi49/mopaliguludopezixobobepet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=chess+coach+pro+mod+apkPDF link annotation
    • 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_off0000dbe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE3 10564 bytes
SHA-256: ead40c49dbf0e2f544869c2e1830c34204f58ccc266977c5f465cfe5e2cce92b
font_01_sfnt_off0000f406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF406 18772 bytes
SHA-256: f02c803252e32915f310dd751d600ee3ebec5c44eb2cf23c32b83bb1bf68eab8
font_02_sfnt_off000125cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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