Malicious PDF — malware analysis report

Static analysis result for SHA-256 f03fb7097a56cfc0…

MALICIOUS

PDF

95.4 KB Created: 2021-09-14 04:21:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0b300309994ec646f854e937cf5d5f7d SHA-1: 1ed7165b704fb592fb3a085d171f350b061ed815 SHA-256: f03fb7097a56cfc031ef60b17efd64d7c1435eeeab407e91a1ab936aa60f7963
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF file flagged as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to disposable domains, indicating a link farm or phishing attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically identifies this behavior, suggesting the document's purpose is to direct users to potentially malicious or scam-related websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://cityfate.com/files/files/51374936665.pdf In PDF document text
    • http://gdlejia.com/uploadfile/files/20210901_103856.pdfIn PDF document text
    • http://ieltsadd.ir/cache/fck_files/file/dajawijututojalokum.pdfIn PDF document text
    • http://gabortech.com/admin/file/75035489805.pdfIn PDF document text
    • http://unibeauty.com.br/ckfinder/userfiles/files/48906214490.pdfIn PDF document text
    • https://istanajpdua.com/contents/files/sarawixazenedu.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/12422562085.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/lomufuruxifoku.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/87733870091.pdfIn PDF document text
    • https://kamarkosong.com/contents/files/puvuruxasepawafu.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/botixotopitukizugal.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16136d73cce468---jakarawivudiwekixip.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16136260d1559c---82786854087.pdfIn PDF document text
    • https://gfwofficial.com/ck_imgs/files/gevujabudofamomi.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/radisodokebovotofibivu.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/57921437189.pdfIn PDF document text
    • https://bnovum.hu/downloads/winuzagelizonure.pdfIn PDF document text
    • http://safiorida.dk/operatori/userfiles/file/14928686129.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/90598248532.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/4996055645.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/67457214018.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/bomuvaloguzagir.pdfIn PDF document text
    • http://ltptech.vn/uploads/userfiles/file/puxoka.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/zenatenofevuzi.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/51331207083.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=game+of+thrones+season+1+episode+7+onlinePDF 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_off00010ca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000124bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124BC 10904 bytes
SHA-256: 0f693d45f5dfb4a75d38542f16b9f5eb30d90fd5ee89acd539ea11f4b32ca394
font_02_sfnt_off00013ddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DDC 19380 bytes
SHA-256: 35e08799fa2f46318066de36257053e8a6462f5fb4dc52d3e63f7156a701b9f7