Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa511683d9847fdf…

MALICIOUS

PDF

69.7 KB Created: 2021-09-22 20:19:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0518cbfb09f04a670034f4f54ed12f6a SHA-1: a937390df4863650aee2da38f12505f1b0a0445f SHA-256: fa511683d9847fdf9b35e68b2f48172813241931a2a75fda8f3e5211f8d65d96
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious intent. The presence of numerous external URIs, many of which are part of a link farm on disposable hosting, suggests a phishing or malware distribution campaign. The 'SE_LOLBIN_RUN_COMMAND' heuristic indicates potential execution of commands, further supporting malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://irlanc.ru/uplcv?utm_term=i+promise+cece+winans+lyrics PDF link annotation
    • https://usssecuritate.ro/userfiles/file/xekebo.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/81638802555.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161433e15d59ce---1647052336.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1d8671dfa---76085033290.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/pezubaruwenewavirigox.pdfIn PDF document text
    • https://phr4u.com/files/15824825075.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/dimikutaju.pdfIn PDF document text
    • http://unityproductions.com/upload/files/42260456969.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/rokewaxabiki.pdfIn PDF document text
    • http://atsolution.org/userfiles/file/20210911214232108816527.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/88926058328.pdfIn PDF document text
    • https://bhavanarayanaswamy.org/userfiles/file/71424853150.pdfIn PDF document text
    • https://narellesastro.com/userfiles/files/saraxulasig.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/60227273197.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/15519166672.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/neguparutozod.pdfIn PDF document text
    • http://ottuk-e.org/userData/board/file/zizowidamipigigamodax.pdfIn PDF document text
    • http://qdcmd.com/data/files/45863626421.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/woninedonodo.pdfIn PDF document text
    • http://web5gstore.com/Files/files/38910026218.pdfIn macro / runtime command snippet
    • http://campbellelectronics.com/uploads/pugamuzesadabu.pdfIn macro / runtime command snippet
    • http://thamdinhgiadaiquang.com/img/files/babodowolusa.pdfIn PDF document text
    • https://takipbizde.com/calisma2/files/uploads/26861096862.pdfIn PDF document text
    • http://whygzy.com/Media/Uploads/files/72091880446.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/64949842277.pdfIn PDF document text
    • http://creaorganization.cIn macro / runtime command snippet
    • 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_off0000b114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB114 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c92b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC92B 10588 bytes
SHA-256: 05ff0d411610db880357b877704da8cea20b94d3084cb9d78cca98bb3853546a
font_02_sfnt_off0000e162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE162 15832 bytes
SHA-256: 98043f91fb4821442d007e8941babbfb1080fa5bbbd36077b00c470e8ed70f18