Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2e59840c6712cb0…

MALICIOUS

PDF

81.8 KB Created: 2021-09-17 08:13:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a3f4b7f8f0ef6d09c5b4219f9fe63f73 SHA-1: 918a64cf3bbc1dd52efe07d3c7f40550dba55b54 SHA-256: e2e59840c6712cb085c7456801b58d255896b71179b521dab30432032523fdad
142 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, many hosted on disposable domains, suggests a phishing or scam lure designed to redirect users to download further malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a link farm structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cartolmania.it/file/44920845811.pdf In PDF document text
    • http://machulski.com/public/file/zozekipexupirabukupuzu.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/bosobarebowadupesakipibu.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/52056374957.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/dekofomatobulikasapanip.pdfIn PDF document text
    • https://advik.net/userfiles/file/topelulaguteduwikaxogolib.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/mowixixika.pdfIn PDF document text
    • https://sambelteri.com/contents/files/rururexugukux.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/16403031026.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/14912314544.pdfIn PDF document text
    • https://linardi.ru/files/file/puxokux.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/8senhkpe01s1tf8u70svujbcc4/13978443477.pdfIn PDF document text
    • https://rrrc.us/userfiles/file/37198688833.pdfIn PDF document text
    • https://italvaping.com/file/siwifusogiwo.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/22476379652.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/52625786814.pdfIn PDF document text
    • http://tuvanthanhlapcongty.biz/upload/ck/files/35465769353.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/69053525039.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/77756848994.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/5846403106.pdfIn PDF document text
    • http://soupworld.de/upload/file/30400736543.pdfIn PDF document text
    • https://cartolmania.it/file/zamedosasojuzapujigevube.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/83610433615.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/59202357272.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161414670b3b95---rugeb.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/zatipabumumexolojowopiteb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=english+words+starts+with+nPDF 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_off0000dd5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF576 10464 bytes
SHA-256: 76d4ebea935472e36e00bba5505482705d44076bbde60a15b23a1983517c86b8
font_02_sfnt_off00010cef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEF 17272 bytes
SHA-256: 2691e02b1cf49274d43c4b3a31d34ae4c446975e22c0e5352c4d0801fa3cb6f3