Malicious PDF — malware analysis report

Static analysis result for SHA-256 c05b0f504a53169c…

MALICIOUS

PDF

88.1 KB Created: 2021-10-12 13:46:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9fc58935393dcb641dd1e261df8adeda SHA-1: cd4fb732d08e5618c702fdd70bd837e8c5921c90 SHA-256: c05b0f504a53169c7cbcc2cebaf4fba70d0b45d74d4635d694ed8fe93f03fcd3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with numerous external URIs pointing to potentially malicious sites. The document body is heavily obfuscated, but the presence of embedded URLs and the overall structure suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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.
  • 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://philabc.ru/uplcv?utm_term=billy+barty+he+man PDF link annotation
    • http://mimarathi.live/assets/ckfinder/core/connector/php/uploads/files/jusovu.pdfIn PDF document text
    • http://nature-revive.org/files/file/wanemofedofipinep.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/kezugaridunololimosi.pdfIn PDF document text
    • http://ducthanhtam.com/uploads/userfiles/file/55570880184.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/mojafegesotukolovozaxuj.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/29571085146.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130bfe92f462---18246309287.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/dobesenetozo.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/sojade.pdfIn PDF document text
    • https://alaskaproauto.net/nbloom/fckuploads/file/68029729219.pdfIn PDF document text
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/14549608065.pdfIn PDF document text
    • https://ever-progress.com/upload/files/fibejidulaweki.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/netokesesinuresis.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/wijoja.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/52742996486.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161406c5da8091---firerireseral.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/3150641544.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/69915412203.pdfIn PDF document text
    • http://kingsap.com/file_media/file_image/file/ritoxitegipewoniguwag.pdfIn PDF document text
    • http://fini.hu/userfiles/file/gurajiziroxefukitugekol.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/25114061494.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///31490206923.pdfIn PDF document text
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/3016511944.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_off0000f4cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CB 10392 bytes
SHA-256: 652e5ecda8c79b594ed5c6a515f762dbcb043d291cab7719dc5d4cf9a2ee8073
font_01_sfnt_off00010c23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12435 18228 bytes
SHA-256: 95dc3ed47cbc2490c0907977ac05e8c1d1c0904aef25e8d1110b9b857dde5a20