Malicious PDF — malware analysis report

Static analysis result for SHA-256 31897f1c9ec34b64…

MALICIOUS

PDF

84.2 KB Created: 2021-09-09 17:09:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 55616490cc6a41b8d88554bdbb009ada SHA-1: cdb33851ac953b566724952571ef631a803c1620 SHA-256: 31897f1c9ec34b6477841d0999fb47bfec391250ade655b54f0e266f76613591
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and a link farm heuristic, indicating an attempt to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URI findings point to a common pattern of luring users to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://archism.ru/uplcv?utm_term=farmville+2+country+escape+mod+apk+latest+version PDF link annotation
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363a8940ef0---16282675523.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/fokedakududup.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/ferofexurozom.pdfIn PDF document text
    • https://spandoekland.nl/userfiles/file/simalorinikewag.pdfIn PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/48334081193.pdfPDF link annotation
    • http://theprojectmanagement.guru/cote_dor_import/admin/ckfinder/userfiles/files/rezojedegurol.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/97022505564.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/bolokunopavozawuraxuvodi.pdfIn PDF document text
    • http://www.ghidmariaj.ro/app/webroot/files/ckfinder/userfiles/files/tajago.pdfIn PDF document text
    • http://nordicwalkingturak.hu/_user/file/namirosagoger.pdfIn PDF document text
    • https://termofriz.rs/files/84047286566.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/tizojokasumawexa.pdfIn PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/mikegalumixumano.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/51043166446.pdfIn PDF document text
    • https://unitytradecapital.com/ckfinder/userfiles/files/96737581514.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/2333062359.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/39273683590.pdfIn PDF document text
    • http://agilesolutions.in/uploads/8009579096.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/62581773455.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/libitelegudud.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/6aboadp058n0qjbn0enbs5sgv1/lemisezubomogusirogero.pdfIn PDF document text
    • http://svadbavmoskve.com/content/xuploadimages/file/64219549986.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/gunekefadidifujurimaposi.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/sokojuvixokokadi.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021090722204673499.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_off0000e37f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37F 11144 bytes
SHA-256: 3e5fe24cc3ad1287067141d1ff37aaada47a860d2830a2988c0ec69a1a9bb2b8
font_01_sfnt_off0000fd9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9D 17352 bytes
SHA-256: 6f68cc79c3b8b4ca51044414bb0257a7603321aac0b5d4b8692ad8ba1a8de194
font_02_sfnt_off00012a57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1