Malicious PDF — malware analysis report

Static analysis result for SHA-256 83e016a949e416f1…

MALICIOUS

PDF

88.2 KB Created: 2021-09-21 13:49:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 949ca08a8503f03a55b55a15b078d1aa SHA-1: cdf34385923819b6189ca915886d5b2ead6c491e SHA-256: 83e016a949e416f1b41584ea543769908f77ca6930fe7a3895df4fe8860c37d5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or scam operation. The presence of UTM parameters in some URLs further supports the phishing lure aspect.

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 https://irlanc.ru/uplcv?utm_term=download+asphalt+8+racing+game PDF link annotation
    • http://residenceraffaellotorino.com/userfiles/files/11872345827.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/84688785410.pdfIn PDF document text
    • https://zakarpattya-tour.com/upload/41039678299.pdfIn PDF document text
    • http://solo-reisen.com/media/images/file/zitatenijojurobafujin.pdfIn PDF document text
    • https://southernwashpros.com/nbloom/fckuploads/file/jidizofovesexesoxuzor.pdfIn PDF document text
    • http://rent-lease-no1.com/userfiles/file/20210904123036.pdfIn PDF document text
    • https://milosislandrooms.gr/userfiles/file/83232752731.pdfIn PDF document text
    • http://lovesenergy.nl/file/40638017080.pdfIn PDF document text
    • http://ccshecea.org/upload/files/zogitiz.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/e69f2da0b1f9bbdc112d2ecae75a788b/2496248531.pdfIn PDF document text
    • http://xlpe.net/Images_upload/files/4554944732.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/26731512142.pdfIn PDF document text
    • http://unionasset.net/file_upload/spaw_upload/file/20210915200823.pdfIn PDF document text
    • https://0922.sproname.com/files/userfiles/files/nazilusokefavuvikelaribow.pdfIn PDF document text
    • https://nomortiga.com/contents/files/xusosedoru.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/sepepekujatageno.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/tafejavikomilipet.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/furifinabokosurusifarate.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/61661879371.pdfIn PDF document text
    • http://eventechsite.com/files/files/fobere.pdfIn PDF document text
    • https://3rproject.eu/ckfinder/userfiles/files/51605020463.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_off0000f1c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C1 11256 bytes
SHA-256: 51f55213a0b2cbeb183c2a0b6bc8cfdc2bcb1024450a72d8e0e76f57b1dcb215
font_01_sfnt_off00010bdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123EE 18200 bytes
SHA-256: 026dd2770024cb73a75d949942061d0740c5763c94a4e8aee85f5cb6ba9e5dbb

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