Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcde7b8097755cbc…

MALICIOUS

PDF

79.8 KB Created: 2021-09-18 19:48:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 71fdbf2bbe224f472b356dcda9c3f321 SHA-1: 6a5cd6b51ec4b1fc66772e0d694f6d0971d7d91d SHA-256: bcde7b8097755cbc5dac81e2da0a27ce9d931c50a1931013b97d761dc34b0811
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm with numerous distinct hosts, suggesting an attempt to redirect users to malicious content. While no scripts were directly extracted, the PDF structure and numerous embedded URLs point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kotypsy.pl/ckfinder/userfiles/files/zuvimogafozagatovaleka.pdf In PDF document text
    • http://naim.naparts.com/images/fck/file/12250370716.pdfIn PDF document text
    • https://ordermorestuff.com/cmsCart/upload/file/letanuvevu.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614151d18829f---dorizasebelegixevagil.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141a1a3ac5bd---53694696066.pdfIn PDF document text
    • http://newbiesites.com/userfiles/file/zopedatugazilos.pdfIn PDF document text
    • https://ksdc.in/userfiles/file/pazew.pdfIn PDF document text
    • http://efcosmetic.com/uploadfile/files/80131007259.pdfIn PDF document text
    • http://king-ber.com/UploadFiles/file/20210907142838601.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/95588299484.pdfIn PDF document text
    • https://glaskunstcentrum.nl/images/file/nowexew.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/pimotuvevijadewidi.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109160826044378.pdfIn PDF document text
    • http://kastely-vacduka.hu/fileok/file/14328337023.pdfIn PDF document text
    • http://lepetitjaunais.com/userfiles/file/nanirovekuzugetebilem.pdfIn PDF document text
    • http://funkyspa.net/ckfinder/userfiles/files/31224249034.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/jotinoxoxidotugoti.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/zodafaxonujusazo.pdfIn PDF document text
    • http://peterpan1996.it/userfiles/files/80817567982.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/2504982169.pdfIn PDF document text
    • http://aristosaigonhotel.com/uploads/files/3069145708.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/97311567042.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/bugawifogurogeri.pdfIn PDF document text
    • http://hiniceshine.com/upload/fuxixiw.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/1914809593.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=carbon+periodic+tablePDF 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_off0000d518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD518 10508 bytes
SHA-256: 35b30d2ea16d8e9132822c992c839ad4292472888295d36c803612b84032178d
font_01_sfnt_off0000ecdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EE 17452 bytes
SHA-256: a1ae63a4a002e9021b211409607cf426a98912899bfb4605f4dd42d5ff00a52e