Malicious PDF — malware analysis report

Static analysis result for SHA-256 f60bb71003aa0e07…

MALICIOUS

PDF

79.3 KB Created: 2021-09-12 01:03:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 6bcb61871ae370026583db7e23bc18b3 SHA-1: 4db0c60de9e4ef027f134da3520e64b8a5ceaf2a SHA-256: f60bb71003aa0e07e4ebc60babe87ac7060a84bb0dc76c55868c5f3b1d656975
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by 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 0.9985

Heuristics 4

  • 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://inwebjor.ru/uplcv?utm_term=how+to+get+latest+android+version+on+older+phone PDF link annotation
    • http://phdpecs.hu/userfiles/files/xujofute.pdfIn PDF document text
    • http://baocaosuhoatoc.com/luutru/files/7207555943.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/matatexivujom.pdfIn PDF document text
    • http://vibrator4you.cz/UserFiles/File/18613394037.pdfIn PDF document text
    • http://recit-de-vie.fr/userfiles/file/55300652990.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/nbk2hjme1glhl0qlpcje441pp2/71035937344.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/26398167789.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/nefixebo.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/xusizuluzedufegamedod.pdfIn PDF document text
    • http://pileki.com/imgup/file/43391852624.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/lexaxexarepozixator.pdfIn PDF document text
    • http://thuaphatlailongthanh.vn/upload/contentFile/minhchau/file/76689240192.pdfIn PDF document text
    • http://aqua4you.hu/userfiles/file/miviromatedajinijanijof.pdfIn PDF document text
    • http://gelinyuanyi.com/upload_fck/file/2021-9-3/20210903193012573142.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/vosus.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/tutavux.pdfIn PDF document text
    • https://academiapreprod.riportico.com/userfiles/files/54111304851.pdfIn PDF document text
    • https://pastelbuilders.com/userfiles/file/bapilinukikevatuje.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/4350132944.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/43517621548.pdfIn PDF document text
    • http://camonetinternational.com/files/file/vitupijizowute.pdfIn PDF document text
    • 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_off0000d346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD346 16780 bytes
SHA-256: b82b01e809a4639d27dd3b1fd6cdfc1b01fcc98f2a0fc35984a468f3666de1b1
font_01_sfnt_off0000fe78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001168f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1168F 10816 bytes
SHA-256: 64a20e0130ba10f5a92e2db14d5de5f8e5625141b2ef93bd50b9c82ed8cc09e8

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