Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ce6e3b735fa011e…

MALICIOUS

PDF

71.5 KB Created: 2021-10-05 01:58:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 99fc3bb757a7c01bd9eb14c7efcde4de SHA-1: f738550c6247ba71c2f95e5aea5adc27cc0c2f78 SHA-256: 2ce6e3b735fa011e152e19740a7a70bb987aadcb3df12dbc3c31683933f1007a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains and link farms, indicating a strong intent to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, identifying the document as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 5

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=among+the+hidden+by+margaret+peterson+haddix+pdf PDF link annotation
    • https://ltes.tw-goods.com/UserFiles/files/sikujod.pdfIn PDF document text
    • http://ketphatthinh.vn/upload/files/99194440950.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/89377298556.pdfIn PDF document text
    • https://sanaspinler.net/calisma2/files/uploads/vebisoziril.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210901_42C0D51121AB3379.pdfIn PDF document text
    • https://shivajigrihnirman.com/singhania/downloads/file/bowul.pdfIn PDF document text
    • http://ksklinika.ru/ckfinder/userfiles/files/75776492888.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/89220208668.pdfIn PDF document text
    • http://kassa.pl/userfiles/file/9832966382.pdfIn PDF document text
    • http://gomsuhoangminh.com/app/webroot/uploads/files/sedajesavefavepofalakov.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/xazavulelagipitipodabowor.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/vuvoj.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1631610483.pdfIn PDF document text
    • https://mimpishio2bet.com/contents/files/wafutopupixumuto.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/91588772770.pdfIn PDF document text
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/18927444402.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/5584891559.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/similuludefarekev.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/ganez.pdfIn PDF document text
    • http://vanxuantravel.com/upload/files/xowidamulakowajurax.pdfIn PDF document text
    • http://xn--m1age8bh.xn--p1ai/files/file/64776638930.pdfIn PDF document text
    • http://inkjetartandimage.com/Uploads/file/vanavumevekugopusan.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140422394530---68805418837.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/16733371697.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_off0000b50c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB50C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD23 11236 bytes
SHA-256: decd23705c82bad8ada2e129c600bf7338c22a960d573102597a405985717eb7
font_02_sfnt_off0000e6dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DD 15788 bytes
SHA-256: 626be2fb93748596b9bdff7feff687025b1a3f4347d1bed105bae519efbd5fb9