Malicious PDF — malware analysis report

Static analysis result for SHA-256 25747dc7de02100b…

MALICIOUS

PDF

81.5 KB Created: 2021-09-11 01:43:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f80b74ec4a6d68a101d595e761f2c8fa SHA-1: 0e86e143d1fcb06263abefdbbdc4cbc6bf2fc42d SHA-256: 25747dc7de02100b38dc9d0022436cf8c712507c6e5a166791a91dcb833c9ded
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded URIs, many of which point to disposable domains and utilize UTM parameters, indicating a link farm or phishing lure. ClamAV detection and ML classification strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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.
  • 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://medvor.ru/uplcv?utm_term=all+android+games+with+controller+support PDF link annotation
    • https://samsunyapi.com/userfiles/files/jepekivefoxuxuliji.pdfIn PDF document text
    • https://www.domosystem.gr/ckfinder/userfiles/files/86379379580.pdfIn PDF document text
    • http://zechnerbau.at/images/content/files/82614156161.pdfIn PDF document text
    • https://majubesar.org/contents/files/11482969515.pdfIn PDF document text
    • https://thehouseproduction.net/file/85705747613.pdfIn PDF document text
    • http://jjc-dev.com/userfiles/file/91024935297.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/53184037100.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/39951711731.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/likegewonukezutadifoxunig.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/50576803821.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/46861974625.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/eebfe9c2dbd2caeb6148621a3664c87c/9618639927.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/21266655313.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/jujogagusakebudevuf.pdfIn PDF document text
    • http://music-summer-courses.eu/upload/files/sowasukifiwotem.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/ragejoregolapisaga.pdfIn PDF document text
    • http://rld-carbon.ru/file/fiderorafutagu.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210906_15987E6512C64A13.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/xutuwirisir.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210906_060311.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/sigidiwu.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/fidoze.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/dudulobaxane.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/vonifotoresufodujuruwesam.pdfIn PDF document text
    • https://nhatngudongkinh.phapluatvietnam.com/upload/ckupload/files/tunijipodikozofokikatadir.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_off0000da09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f21b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21B 17016 bytes
SHA-256: bdefcde8ee26a5d7b62473810ea32eef87df123709a0556f263f6f746783df62
font_02_sfnt_off00011e29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E29 11128 bytes
SHA-256: 42cf9ca65eb3678cf668cf9c0f5191b41bb29fc0a9d140aacea67b7695c393d5