Malicious PDF — malware analysis report

Static analysis result for SHA-256 a606dc549d52399f…

MALICIOUS

PDF

81.9 KB Created: 2021-09-12 11:38:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5e3bfee050836ff701540aeed82de5b3 SHA-1: 41606badf1d6b210f4070ad08c79443870477c67 SHA-256: a606dc549d52399fe59460bf2c599a4acbc1ec36a654be1e6977817a6bbc6809
134 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm structure. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF. The numerous external links, including one pointing to a potentially disposable host, indicate a likely phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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
  • 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://gencshoworganizasyon.com/upload/ckfinder/files/metorinufu.pdf In PDF document text
    • http://daiichibus.vn/uploads/news_file/vebozigedidopega.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/44174791299.pdfIn PDF document text
    • http://litroshaber.net/resimler/files/xusikepulavelowagas.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/36951560583.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/87246560847.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/89995194461.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/65380816096.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/69276446735.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210912075822.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/lovazisuvad.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/46819063110.pdfIn PDF document text
    • http://7m-shop.com/userfiles/file/62679808444.pdfIn PDF document text
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210905070634.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/ludixer.pdfIn PDF document text
    • https://tonthephunglan.vn/upload/files/14685768497.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/biwove.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/darusezoser.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/31540058793.pdfIn PDF document text
    • https://www.bankkartya.hu/js/ckfinder/userfiles/files/sapidigokujip.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/84101508133.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d28df58ffe---nesogexogezunupajosed.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/matuvanotewuxujaveriva.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/97076486016.pdfIn PDF document text
    • http://style4.allwebeasy.com/userfiles/files/vijopukez.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/xemerusakebodavenamevixum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=cara+live+streaming+lewat+hp+androidPDF link annotation
    • 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_off0000d9b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C5 17712 bytes
SHA-256: 2476ba68a74dcde58954db3eca753e19f635418a5f097a262f5725b202addbe4
font_02_sfnt_off00011ff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF0 11020 bytes
SHA-256: 547359b6f3232d96bc90cfea450801c0855364cfe83d3e772ba8148d41de32bd