Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ef091b8541243ea…

MALICIOUS

PDF

79.6 KB Created: 2021-09-16 19:11:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6ed96835c3ef9859b51a96a27173f9c5 SHA-1: 1e124e5ec24e1cb5220fbde0b29b6a390e51999c SHA-256: 1ef091b8541243eaedf1783cb6c856e61d11d8dadcae80ae8a1b32715a6106f9
134 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains embedded JavaScript and numerous external URIs pointing to disposable domains, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to host a large number of links on low-reputation domains. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://garglob.ru/uplcv?utm_term=how+to+transfer+from+android+to+new+iphone PDF link annotation
    • https://guenangequitation.fr/www/site/js/ckfinder/userfiles/files/98296528553.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/96908702721.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/dudipivukobanugezudol.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/jivume.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/voxag.pdfIn PDF document text
    • https://rinducm1.com/contents/files/famugokivediluwut.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/9720530666.pdfIn PDF document text
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/88307746214.pdfIn PDF document text
    • http://inteko-tula.ru/f/file/29055060488.pdfIn PDF document text
    • https://arabadvertise.com/userfiles/files/moxorerisa.pdfIn PDF document text
    • http://storemisr.com/uploads/files/64079965505.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613677fde1023---25645823737.pdfIn PDF document text
    • https://segurodegranizo.ar/noticias/fckeditor/file/tofimipakezexoru.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/fuvarem.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/pojawawejotigi.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/sirudogumi.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bupebijotezerabuja.pdfIn PDF document text
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/41254484741.pdfIn PDF document text
    • https://7mark3t2-7aya.com/contents/files/lozopobifukiratadezomuses.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/97168392500.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/dd45e6f299fc1c3bd885604dc33b5fb4/vilafitijeginesujife.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/73725928915.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/dadifitujeganurusonolew.pdfIn PDF document text
    • http://valencia.thepokeluau.com/uploads/files/93951571068.pdfIn PDF document text
    • https://aathichudi.org/userfiles/file/9755175940.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_off0000d1a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BF 10792 bytes
SHA-256: 4e1f5ddaab1734a1a2b2b52f1e73f197a52440eb3adc69913bdf110faa4819c7
font_02_sfnt_off0001026b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026B 17872 bytes
SHA-256: c006e0a570fd2174fff8f1da107efbd4bed7e26106e4f5af2d3b0d0e940b7767