Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fcbf121dffc164c…

MALICIOUS

PDF

70.0 KB Created: 2021-09-19 17:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9469ce1b9a77b3e1a43b3c98c3a89015 SHA-1: e2681dc70f50bda9355f26d013d429bce2d1ef31 SHA-256: 2fcbf121dffc164ca4038ae9db3168d14b2fe37756b4688502bf35be89f5ef1d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and multiple external URIs, indicating malicious intent. The ML classifier and ClamAV detection strongly suggest this is a malicious PDF, likely used for phishing or malware distribution. The presence of embedded JavaScript points to its use in executing malicious code, potentially to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://infrive.ru/uplcv?utm_term=pokemon+mega+adventure+download+for+android+gba PDF link annotation
    • http://proxima-design.cz/files/file/durenugizumi.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/dikiz.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/48191123557.pdfIn PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76618078765.pdfIn PDF document text
    • http://artdental.hu/editor_up/tuzazejelisavap.pdfIn PDF document text
    • http://ranczowdolinie.com/files/53264807120.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/87440521685.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3af069d0d---60897033854.pdfIn PDF document text
    • https://servicepapik.ro/files/94036530201.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202109020227543723.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcc7fdba7e---kufemokejawudokufosisatan.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/sarusizupegebebosozed.pdfIn PDF document text
    • http://sfalojistik.com/userfiles/file/79646353073.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/56076137956.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/37814574009.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/pakupofagalobitikejofusak.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/jajidunevorinezofavoved.pdfIn PDF document text
    • http://roseeskin.com/userfiles/file/20210919150058.pdfIn PDF document text
    • https://beautydent.hu/editor_up/44924367130.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/vuratovepepujoku.pdfIn PDF document text
    • https://bonekarusa.com/contents/files/zoxodilemewetatukoludaje.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_off0000b13e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB13E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC955 11016 bytes
SHA-256: 744bc0fa986410412794608733af6bd3b95556fe0481a7f25e5bbadee35f4115
font_02_sfnt_off0000e2c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C5 15552 bytes
SHA-256: c06226621a947803786478ab29f908f79350190bd2afabad614783de0f54e7ca

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