Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fd2045ab10d8835…

MALICIOUS

PDF

77.6 KB Created: 2021-09-20 00:47:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 49acee6f34b4c45b8b397a03c17e07f7 SHA-1: 184e78ad06b90ca699c7437425dfaa11914e6729 SHA-256: 0fd2045ab10d8835bacc5aa69fc9213d24cbfcc29cbb93190fc9b966b93dac9c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded URLs pointing to various domains, many of which appear to be link farms or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://philabc.ru/uplcv?utm_term=difference+between+average+rate+and+instantaneous+rate PDF link annotation
    • http://hutnia.pl/userfiles/file/tataxo.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/70133280486.pdfIn PDF document text
    • http://domosplast.hu/files/file/fakodali.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/nojepovodudenivilaja.pdfIn PDF document text
    • https://gogreenonline.net/userfiles/image/fckeditor/file/33440799969.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/mavoxaloduxepobewiz.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc1645a6be---wolinubasesiba.pdfIn PDF document text
    • http://glassick.com/userfiles/file/68809792432.pdfIn PDF document text
    • http://hoangnampte.vn/quangbasanpham/app/webroot/upload/image/files/82114447506.pdfIn PDF document text
    • http://gevenschoenen.nl/ckfinder/userfiles/files/vujosedogodijil.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/1699176010.pdfIn PDF document text
    • http://holzweiss.at/42281706776.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132082e3b0f3---591412616.pdfIn PDF document text
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/rububazeriwavo.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/wedofikoxanuridazejapud.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/70864795595.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/vuvekerejavogoza.pdfIn PDF document text
    • http://malerbetrieb-malanders.de/Webseite/pics/fotos/1/file/bezuxawiraxijezi.pdfIn PDF document text
    • http://odessawa.com/userfiles/file/boboponofafamo.pdfIn PDF document text
    • http://skazka76.ru/pic/userfile/rasoma.pdfIn PDF document text
    • https://www.thaiahpa.com/flash/files/tivazuligoroliziro.pdfIn PDF document text
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/14256121371.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/baderuker.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_off0000c714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC714 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2B 10996 bytes
SHA-256: cd5b6e6a96258b804d89133405fcebf58208f87938f231b9cf85a22e5b3308af
font_02_sfnt_off0000f8c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C3 18168 bytes
SHA-256: 598a4a5326826addbd9c8dc76fa61b5474e203ff2f68bb05149b80209acdc81e

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