Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8563de8d89576d7…

MALICIOUS

PDF

69.6 KB Created: 2021-10-04 02:30:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c298e6a8c2dc73807791f6d10c2faf8f SHA-1: 748527f17c8d9858970538205a7a3e110d45a24e SHA-256: f8563de8d89576d71021f564ff810d06b3cb8b00e1eb66dc9d6e40b5f497fbd0
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a high-confidence heuristic identifying a link to an algorithmically-generated URL on a disposable domain. ClamAV detection and ML classification further indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure suggests a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://propertiproperty.com/Uploads/userfiles/files/14684685580.pdf In PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/kotofe.pdfIn PDF document text
    • http://skisun.it/userfiles/files/6325118361.pdfIn PDF document text
    • https://heureka-cz.eu/files/lepobujuwujagapotireli.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/33017352707.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/24434571001.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/sulaletitusub.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/7862556802.pdfIn PDF document text
    • http://mislenyiallatorvos.hu/userfiles/file/55219150221.pdfIn PDF document text
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/62137704718.pdfIn PDF document text
    • http://velomagazin.hu/UserFiles/file/ratofizenunelu.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/2603297360.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/zimojab.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/gazadokefikoxu.pdfIn PDF document text
    • http://ctcinsulator.com/uploads/file/79335502035.pdfIn PDF document text
    • https://exhibitproplus.epponline.com/mentorfinancial/page_images/file/sorixutesuwogukumaluw.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/15956432906.pdfIn PDF document text
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/80467920097.pdfIn PDF document text
    • http://appartementslisa.it/an3_Uploads/file/letexizexilefuneve.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/42908384843.pdfIn PDF document text
    • https://pkmoscow.ru/ckfinder/userfiles/files/pomitobebolet.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/65642514357.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/19664297425.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/tipigenirugekutom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=what+does+msds+stand+for+in+chemistryPDF 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_off0000b175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB175 15048 bytes
SHA-256: a97c9fd973725ab448f5491e9aef4106d8317def2d21871b0d8ca2ee5ef48636
font_01_sfnt_off0000d7b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B3 10800 bytes
SHA-256: 0eae951b5de262b8d97ef5760b6a75e261dc63445429adabfbeeecc018f580dc
font_02_sfnt_off0000f075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF075 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1