Malicious PDF — malware analysis report

Static analysis result for SHA-256 5baefd456023574f…

MALICIOUS

PDF

81.8 KB Created: 2021-10-09 17:46:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: aaa6b76750be72119c7ae654ac61cf5c SHA-1: d7e248d887125d02f3b85001e86d9dbfc7794b9b SHA-256: 5baefd456023574fa68ed7c221faf953436ede2f33f7d55f8220434d75831ea5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. It contains numerous embedded URLs pointing to unknown domains, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent, likely spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://khachsansapa.vn/webroot/img/files/wonazon.pdf In PDF document text
    • https://yp05.com/_UploadFile/Images/file/kesodezufowe.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/249933136.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/bebofuzowikojofipokor.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/duwekovikometazosamozoz.pdfIn PDF document text
    • https://fallahi-sch.com/userfiles/file/mutinakeforiz.pdfIn PDF document text
    • http://espaciocultivarte.com/ckfinder/userfiles/files/9354697125.pdfIn PDF document text
    • http://hbisan.com/userfiles/file/bavuduj.pdfIn PDF document text
    • http://china-miyaco.com/img/file/20219602832.pdfIn PDF document text
    • https://adikmanis.com/contents/files/nebokawezaxazikoxeve.pdfIn PDF document text
    • http://seritour.com/rsm/files/30571415469.pdfIn PDF document text
    • http://hidramaco.com/files/files/pulubatonisiteb.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1615b6a0b3834f---jifizaxesivodeje.pdfIn PDF document text
    • https://migger.dk/userimages/file/fezosebogaripifadoxu.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/6597425701.pdfIn PDF document text
    • http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/41147602426.pdfIn PDF document text
    • http://simonide.org/userfiles/file/mezejexob.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/vonumuwizadasejiwifotede.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/dalalazalu.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/72923940126.pdfIn PDF document text
    • https://foulardfotografando.it/file/wakasodot.pdfIn PDF document text
    • https://efckrakow.pl/userfiles/file/30899842072.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/pukerudizetotewipoti.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/39141526883.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=bass+and+treble+clef+ledger+linesPDF 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_off0000dac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC1 17532 bytes
SHA-256: a9e306b4c1a75c10232cfc215ce8836f9f8fd60aeaeee08c07a2b82cfc596d77
font_01_sfnt_off00010865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10865 10724 bytes
SHA-256: e3577e4b9dc00a63e06d21384c8e557f2915c89cc21c8c38d9e60482d26b5a22
font_02_sfnt_off000120ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1