Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8487b96baaa24b9…

MALICIOUS

PDF

89.7 KB Created: 2021-09-10 06:55:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: ee3f79408dd2b48e1ba993049b76b645 SHA-1: ac4abbb7d10a85f977009e579c8c770c2ded5995 SHA-256: a8487b96baaa24b949596628d3b2835cc1cfea296ddc8f24e902147d3e95cbd6
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://metabolizmusonline.hu/images/upload/file/60856034447.pdf In PDF document text
    • http://mobilahomedesign.com/userfiles/files/34916949030.pdfIn PDF document text
    • https://ibericadearmerias.com/file/lonefuf.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/89617741535.pdfIn PDF document text
    • https://omprintandpack.com/userfiles/file/54500622370.pdfIn PDF document text
    • http://deforma.it/userfiles/files/21812628031.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/71487141795.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/tazip.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/47017024464.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///19526042079.pdfIn PDF document text
    • https://tspinstruments.com/cache/fck_files/file/65457709364.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134bd3f22e9a---bituxagufom.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/tisupugenokarunubuxamelor.pdfIn PDF document text
    • http://optometrystaprzemysl.pl/userfiles/file/rolemizutuwuterelowede.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612efca42b46d---monigigoporowotibufibi.pdfIn PDF document text
    • http://taigesw.com/upload/files/vixivudizo.pdfIn PDF document text
    • http://bytip.net/filespath/files/20210910053542.pdfIn PDF document text
    • http://talleresjpg.es/img/file/4101304580.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/65652280299.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/76219575035.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/84159604568.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=unturned+coalition+vest+idPDF 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_off0000f9ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111BD 18188 bytes
SHA-256: c290dcdfe31dae63379f39e6ec9fce19aa3a33f8af2d7821dbb7af3f5b3df0f8
font_02_sfnt_off00014155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14155 10536 bytes
SHA-256: a9ddae40abdecb2de180fd89e2525c0b42950669062437e45c1d3eac5ee8dc68

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