Malicious PDF — malware analysis report

Static analysis result for SHA-256 01241c1a64215300…

MALICIOUS

PDF

74.7 KB Created: 2021-09-18 07:52:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d9c5f50bce4e086514fd974b27ff1945 SHA-1: e49e74b098874f4c751f4e64e932f020a2a8b227 SHA-256: 01241c1a642153000aa7628dc731885b8c54f38967e60c07f2c7eae11c686f8d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to a link farm, a common tactic for phishing or distributing further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://mtmnetwork.net/uploadEditor/files/63787561768.pdf In PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210903165141.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/93662865448.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/fupigepovomomanuzasaja.pdfIn PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/ximadujadipib.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///68375411602.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/6760320579.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/68275162105.pdfIn PDF document text
    • https://akvaguru.hu/user/file/56779107926.pdfIn PDF document text
    • https://nevisnews.com/userfiles/42074471270.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/voxazawomusemotivobogero.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/17233583794.pdfIn PDF document text
    • https://istanajpdua.com/contents/files/90377662519.pdfIn PDF document text
    • http://harlit.com/upfiles/file/xenaxesisakofuriz.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3b5c4d061---figupadoxojopisizel.pdfIn PDF document text
    • http://hermandadperdon.es/userfiles/file/vasafuniz.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202109082059173566.pdfIn PDF document text
    • https://southernwashpros.com/nbloom/fckuploads/file/22569365175.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/42646417713.pdfIn PDF document text
    • https://vas-vill.hu/userfiles/file/83345877071.pdfIn PDF document text
    • http://school15-tyumen.ru/f/pasajezig.pdfIn PDF document text
    • https://hotnewsmd.deca.md/upload/userfiles/files/94048512746.pdfIn PDF document text
    • http://runnersavezzano.it/public/userfiles/file/56129427895.pdfIn PDF document text
    • http://asupuro.com/user_data/image/file/62946014252.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/62557665011.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=321+action+apkPDF 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_off0000c155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC155 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d96c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96C 10260 bytes
SHA-256: fe33c5b7c07ed7d9290a6c75489917cc737f73df8520a92fc6925d9188326223
font_02_sfnt_off0000f0b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B8 17088 bytes
SHA-256: ce2e4579f8a30c70bbb71c7acc32d25c5026c100ad9adf229696bd884cc3bfd4