Malicious PDF — malware analysis report

Static analysis result for SHA-256 321a41b6915e799d…

MALICIOUS

PDF

87.9 KB Created: 2021-03-13 17:07:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 82d28c918ec324d865479fdb938a2a01 SHA-1: aaba9b98172bae7f68d73270b9cbeebd8987c60f SHA-256: 321a41b6915e799dbe6349d27b5a24937d450648cf72b5c2ccbea2b7c09c49e6
126 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for distributing malware or phishing for credentials. No scripts were extracted, but the PDF structure and embedded URLs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/award?keyword=josaa+medical+certificate+format+pdf PDF link annotation
    • http://nafarami.medianewsonline.com/51626919246.pdfIn PDF document text
    • https://nonejekorozu.weebly.com/uploads/1/3/4/1/134108542/zibavikuzekiwilil.pdfIn PDF document text
    • http://jokojujut.medianewsonline.com/what_does_pull_quotes_mean.pdfIn PDF document text
    • http://pobesegu.scienceontheweb.net/92058997029.pdfIn PDF document text
    • http://nurokojo.mypressonline.com/aviso_previo_do_empregador_para_dispensa_do_empregado.pdfIn PDF document text
    • http://boxidodo.22web.org/genabutapawikijewomaponop.pdfIn PDF document text
    • https://wefizaxire.weebly.com/uploads/1/3/0/9/130969527/fuzonivikerizinusi.pdfIn PDF document text
    • https://kekufakaxuw.weebly.com/uploads/1/3/2/7/132740700/fd4bb84294.pdfIn PDF document text
    • https://dijajogid.weebly.com/uploads/1/3/0/8/130874349/1091704.pdfIn PDF document text
    • http://jolidulikan.scienceontheweb.net/brahmacharya_celibacy_for_students_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pojuzuduxotazup.epizy.com/tupomipuxixiriguzo.pdfIn PDF document text
    • http://zirivog.rf.gd/diliduwemajosimomekufe.pdfIn PDF document text
    • http://wulibazosuxib.onlinewebshop.net/25241917114.pdfIn PDF document text
    • http://lexafuz.epizy.com/rupumowiradanik.pdfIn PDF document text
    • http://vuroxazejugu.epizy.com/mibugako.pdfIn PDF document text
    • http://bumitorazefi.epizy.com/siwinamatafojaxor.pdfIn PDF document text
    • http://ludoxijijux.rf.gd/rezofusevagija.pdfIn PDF document text
    • http://muziwuxakujaxa.rf.gd/jujufakesuxilaf.pdfIn PDF document text
    • http://xomapagovujux.atwebpages.com/xeferufofa.pdfIn PDF document text
    • http://zorufuzelal.rf.gd/annamayya_movie_songs_free_naa.pdfIn PDF document text
    • http://nesoruzesin.epizy.com/povudokaw.pdfIn PDF document text
    • http://rudemunipa.epizy.com/kidde_smoke_detector_beeps_once.pdfIn PDF document text
    • http://nivuzujanux.myartsonline.com/canela_de_velho.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000119b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B9 5288 bytes
SHA-256: cfa8137ff4023aac7935d199ff98a9d3f61f99c5c9a8d6d0b0c056789d6f05d9
font_01_sfnt_off00012b9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B9F 11228 bytes
SHA-256: f644f7c0f90612ff9f07a1b97bcaa56841c471a16bf92b517c7acd074add5104

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