Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e6f2aae0d54171b…

MALICIOUS

PDF

83.8 KB Created: 2021-09-17 04:58:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8f427e4273bdbe7b6c7663821a0a1a86 SHA-1: e70b5a43f13f26d0558667a4cc37e97512498613 SHA-256: 7e6f2aae0d54171b96ff566ed5660023687dea3ae29c1ca1b1360b0d8367335f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. The presence of external URIs and the link farm structure strongly suggest a malicious intent to redirect users to harmful content.

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 https://huntic.ru/uplcv?utm_term=multiling+keyboard+classic PDF link annotation
    • http://climtech.com/files/files/woxojax.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/14193638290.pdfIn PDF document text
    • http://sun-tes.ru/files/file/41260933531.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/jiwipiferezoliwefizoz.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/17089ccddd2d354ca2264ba4791fb20e/wojepidaraw.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/getopejukitaketozopok.pdfIn PDF document text
    • https://technoarc.net/userfiles/file/jalesirudanowozi.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202109081937575207.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/59893093558.pdfIn PDF document text
    • https://derfo.info/resimler/files/tikopetuvukevo.pdfIn PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/kobesinur.pdfIn PDF document text
    • http://abnigakgdsg.friendship-match.com/upload/files/lalutiwevisezuginap.pdfIn PDF document text
    • http://labsshop.com/d/files/4491634801.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/vivabuvagofotaxif.pdfIn PDF document text
    • https://austarpharma.com/upload/files/57891778783.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613edc36ea057---rezupiluzupepabitalada.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/goliboribimajanuduk.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8d6c76e9b---towozedikamebizudewawodim.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/52848296981.pdfIn PDF document text
    • https://shturnev.com/files/foFKED/file/venepugupojoporegukokif.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/78099725633.pdfIn PDF document text
    • http://land89.com/ckupload/files/motemig.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/visidoj.pdfIn PDF document text
    • http://www.huescalamagiaenfotos.com/userfiles/files/59854312368.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/39044488578.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://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_off0000dcb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB7 19368 bytes
SHA-256: 4f93ebbd49a21f0c608445d27f4771611f678e4dcecfa23798534d7166289e3f
font_01_sfnt_off00010fb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C8 10984 bytes
SHA-256: f6edc4938baf56a2fdeeaf638311c8701342d8a6e92d7b15a5c00c3bcb420950