Malicious PDF — malware analysis report

Static analysis result for SHA-256 21968f845d41a1f7…

MALICIOUS

PDF

85.8 KB Created: 2021-09-13 23:06:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f0470982dd8c09712d2832fb85cac71d SHA-1: 9e97b19c4c6dd7f7cbe71a7a7d1c1b618cfa310c SHA-256: 21968f845d41a1f78d1ecb314b58cac1acc3871d760a0fa5b0c7e5304e513fe9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host multiple links on disposable domains, likely to obscure the true malicious destination. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://shevtsov-art.com/uploads/files/kikizadozejamepajeduso.pdf In PDF document text
    • http://naoshima-tours.com/images/blog/file/16199558030.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/dapitotizoxoxen.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/tuvazikajudogoxujij.pdfIn PDF document text
    • http://asja.ua/userfiles/file/xepaxazakadivolalulijewa.pdfIn PDF document text
    • https://cplastik.net/data/cms/file/vezeporoginatifeg.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1613791167adc4---46552983265.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/dopefo.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/93545467669.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/5375193454.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/dexuvelu.pdfIn PDF document text
    • https://bagstyle.uz/images/file/lajalotosonivurabidex.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/9627115235.pdfIn PDF document text
    • https://yam-token.com/business_school/uploads/file/4413855931.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/57209954165.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/lenesorasawapokex.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/64128514347.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/87449078166.pdfIn PDF document text
    • https://flavio-tonon.it/public/file/1482259669.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/tadubuxawojerosoforel.pdfIn PDF document text
    • https://globaltranslation.com/demo/global_translation/beta/userfiles/files/54121544019.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613e41af1daf5---fewatatape.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/16372509717.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=android+apps+surface+pro+3PDF 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_off0000e9de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DE 18056 bytes
SHA-256: 61c48d30bc5cdba6d531ff618047b424f9f805afe3badcac55aa8328619c93c6
font_01_sfnt_off000118d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D4 10724 bytes
SHA-256: ac0f0aece1264cd19cfc71023a833ecfd3c1ef8f7bf05f10769ae28bc5cf2151
font_02_sfnt_off0001319b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1319B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1