Malicious PDF — malware analysis report

Static analysis result for SHA-256 c798c106b0a55e45…

MALICIOUS

PDF

137.0 KB Created: 2021-03-27 21:54:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 787eb6b51ca5fb6ff2aeecbf205c9409 SHA-1: 14dfd22d19e142247d0d105d1299e65dc725cf63 SHA-256: c798c106b0a55e45644ffbf3df3b80b2ffa8b07b73f86bc8108556c67ecf3536
246 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses brand-impersonation credential phishing. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://waxosutuj.weebly.com/uploads/1/3/1/4/131437699/d1c4f5abca18dd.pdf.
  • 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://nipisod.ru/award?keyword=history+of+islam+after+karbala+in+urdu+pdf PDF link annotation
    • https://waxosutuj.weebly.com/uploads/1/3/1/4/131437699/d1c4f5abca18dd.pdfIn PDF document text
    • https://tabogivazosepa.weebly.com/uploads/1/3/1/8/131871767/bawegalenizijov.pdfIn PDF document text
    • https://tesevazaxuj.weebly.com/uploads/1/3/4/4/134476418/6400e7d.pdfIn PDF document text
    • https://cdn.sqhk.co/koletexun/ajchgjg/simpsons_tapped_out_forum_deutsch.pdfIn PDF document text
    • https://womutiliwefol.weebly.com/uploads/1/3/5/9/135964171/baposenumujejero.pdfIn PDF document text
    • http://wozuwekifebar.iblogger.org/11044429350.pdfIn PDF document text
    • https://zugogulubituwo.weebly.com/uploads/1/3/4/2/134266111/gagojamekijoxe.pdfIn PDF document text
    • http://larumutul.getenjoyment.net/ap_inter_1st_year_sanskrit_text_book_2020.pdfIn PDF document text
    • https://rarerosedipise.weebly.com/uploads/1/3/4/8/134876587/kopunawunodudosu.pdfIn PDF document text
    • https://cdn.sqhk.co/zumedizojas/ijbFTgd/teketuwunofopojetib.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d6bf9bfb-c092-4b17-ab9f-91da83e6a9d2.filesusr.com/ugd/d7ad14_0fff112f82704ca2b376163eae3d701a.pdf?index=trueIn PDF document text
    • http://zozivudo.rf.gd/easy_acrylic_painting_ideas_flowers.pdfIn PDF document text
    • http://butorinowu.myartsonline.com/biblia_de_estudio_plenitud_gratis.pdfIn PDF document text
    • https://d128792e-e0a8-46e0-98ed-b941f5da69b2.filesusr.com/ugd/b98abb_384cef61ea724b4fba616d3ddadb28c3.pdf?index=trueIn PDF document text
    • http://xilavivugup.epizy.com/tuvejamasogigeluxavojov.pdfIn PDF document text
    • http://fujaled.epizy.com/sulutolibufuxewusak.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://scripts.sil.org/OFLIn 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_off0001bfaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BFAA 5452 bytes
SHA-256: c782e627e3562533ccbbeea7a14a7029197e33f167d637999ce54af9061299eb
font_01_sfnt_off0001d220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D220 13664 bytes
SHA-256: 5dc4ae89b85bfacbc65bcfb13086ea03596821f88a517bab53c42d505da7dd6e
font_02_sfnt_off0001fd65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FD65 17108 bytes
SHA-256: 42f225816c12b9b962dbc960bc78a27a1eae0a68086643fb5915316b5ef4d811