Malicious PDF — malware analysis report

Static analysis result for SHA-256 493e6f99ae2b023f…

MALICIOUS

PDF

73.7 KB Created: 2021-02-20 02:21:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2d58f7317049c69c767571affdb7723 SHA-1: 54a3ec5ae82152b361fa7ebf9a5520aed5595eb4 SHA-256: 493e6f99ae2b023f17bf831d3c89ff564d3e3a069a926652826cc5eaa89bd510
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for phishing or distributing further malware. The ClamAV detection and ML classifier strongly indicate malicious intent. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' suggest the document is designed to redirect users to a network of malicious sites, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/strik?utm_term=distribucion+normal+estandar+z+ejemplos
    • https://tewamuwomipatus.weebly.com/uploads/1/3/0/9/130969874/perijosabudaliwiw.pdf
    • https://cdn.sqhk.co/fifapupifig/eshichx/duplicity_against_in_a_sentence.pdf
    • https://pivamuwonojazop.weebly.com/uploads/1/3/0/9/130969183/0884ee.pdf
    • https://cdn-cms.f-static.net/uploads/4444092/normal_5fd2df3acc1e8.pdf
    • https://static.s123-cdn-static.com/uploads/4480898/normal_5fce1827b0a97.pdf
    • https://cdn.sqhk.co/futevanu/HigheEt/all_in_one_offline_maps_full_apk.pdf
    • https://cdn.sqhk.co/pizokifuxe/rIchcgg/art_therapy_colleges_in_florida.pdf
    • https://kerejokav.weebly.com/uploads/1/3/1/6/131637695/duvajiraxejosibon.pdf
    • https://tanuroxej.weebly.com/uploads/1/3/4/1/134131309/705b70de6c1.pdf
    • https://tidemipevu.weebly.com/uploads/1/3/0/7/130740592/simuxibafadoler-jififibubuxuna-pezodijotuwi.pdf
    • https://cdn.sqhk.co/laxefotogulo/aCidhOI/85259010008.pdf
    • https://static.s123-cdn-static.com/uploads/4387408/normal_5fc8d48d98c3c.pdf
    • https://cdn.sqhk.co/nufopusifa/haRGgjM/dietbet_app_cost.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gukupexokopiwug.epizy.com/75593743908.pdf
    • http://tepusijanakigat.epizy.com/35505553138.pdf
    • http://zadabodemuliju.epizy.com/business_math_printable_worksheets_3rd_grade.pdf
    • http://wojuzixe.epizy.com/guide_des_habitudes_de_travail.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfc5.bin
ff529b04367e71c98d01ce9e44180b28e1b17ec03add4bd5538ad0ceafcc6551
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC5 5484 bytes
font_01_sfnt_off0000f25a.bin
dba1e80df9080dd185517e772078f6b2472e5b3e1485baef54003f94f8ca5b6e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF25A 11556 bytes