Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b4dc95018571818…

MALICIOUS

PDF

73.4 KB Created: 2021-09-26 11:34:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4c9764d41f1a12059a3b07f34e92b3cb SHA-1: 9f967221b1725fa1870126facfc076d5b77e0e60 SHA-256: 2b4dc950185718180240a861e4729adaf46d1aed4b05647d41cc0b25222368a6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://garantc.ru/userfiles/file/xolejenabobeporupadebi.pdf In PDF document text
    • http://lechioutdoor.com/userfiles/file/72368717456.pdfIn PDF document text
    • http://bellamy.tw/uploads/files/202109251704572761.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/38929898598.pdfIn PDF document text
    • http://budka39.ru/files/19073131715.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210917_ED38AF0FAA193EF5.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/845c94d4df5fff5ac500ce60a2e2b82a/pefopomopurilixive.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/gabowezonupiwinuv.pdfIn PDF document text
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/41269241950.pdfIn PDF document text
    • http://anm-av.de/uploads/files/wiwurabit.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/29439517898.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/zater.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/sidawupi.pdfIn PDF document text
    • https://ontech.vn/images/ckeditor/files/72235429980.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/68641940774.pdfIn PDF document text
    • https://posetili.ru/userfiles/file/10234053822.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/moninibitupoxozifuvolo.pdfIn PDF document text
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/bakod.pdfIn PDF document text
    • http://craftland.de/res/wysiwyg/file/tolami.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/94623567120.pdfIn PDF document text
    • https://temporar.mirceaseminee.ro/printuri-fi/files/zaxezerifib.pdfIn PDF document text
    • http://stluciachamber.org/uploadedImages/contentImg/file/sawasojosarupufaxited.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=malabon+city+postal+codePDF 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_off0000b702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB702 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF19 10656 bytes
SHA-256: d81ead6da07e430857cc28f7a9f6fdb9d60806827fd6b5775d5fb7fb0e277fdf
font_02_sfnt_off0000e771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE771 18648 bytes
SHA-256: b36890d19b628f47055ca8a385177b0afe4572f5b1f7413dacca53adbd141b08

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