Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f1b46b546912015…

MALICIOUS

PDF

87.6 KB Created: 2021-04-22 22:26:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: f46d9ed851890a281c3fa9f57e0365e5 SHA-1: 9bc934430cb3aa0a2729c340447db5f3bb475230 SHA-256: 3f1b46b5469120154d9cb7e63abcae8ce209a56d8edaba8108411eade1f756e4
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_URI' heuristics. The ClamAV detection and ML classifier further support its malicious nature. The embedded URLs suggest an attempt to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://resalured.ru/strik?utm_term=american+history+museum+division+2+backpack+trophy PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4409610/normal_5fdf106fa2b51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365606/normal_600be01d6159f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487192/normal_6064b62a45cb2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417313/normal_60342ded5c9af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468823/normal_5fe85cb787d48.pdfIn PDF document text
    • https://cdn.sqhk.co/zupololano/cUgdgjC/rise_2_glory_ww2.pdfIn PDF document text
    • https://cdn.sqhk.co/bexefoboxevi/bRjh3ge/whatsapp_video_call_recorder_for_android.pdfIn PDF document text
    • https://cdn.sqhk.co/bularalunop/gd7hhON/1672596957.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471691/normal_601ed6a4099e8.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/2fjdugc/candomble_religion.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465537/normal_5fc7382a445f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426415/normal_60110192e0fab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409122/normal_5ffdbe0e34d98.pdfIn PDF document text
    • https://cdn.sqhk.co/vakanaju/igeifaU/47046598423.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408346/normal_5fcc1d5f4d400.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/27916799-0393-4acd-bfb3-a974d059eb7d/11547220809.pdfIn PDF document text
    • https://6eed613e-cbae-405e-b458-9655ef9033f8.filesusr.com/ugd/e4f6f0_d65c30a4a23a47869756e28c214a9d20.pdf?index=trueIn PDF document text
    • https://835a0401-7144-467e-aacc-710587930ffc.filesusr.com/ugd/432cba_7b4a5c248b554616926cc8504c2ab3e9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tobojelusiwi/alphabet_pictures_a-_z.pdfIn PDF document text
    • https://s3.amazonaws.com/kewakuko/correct_plural_form_for_analysis.pdfIn PDF document text
    • https://s3.amazonaws.com/dudigonifu/vebivitojivojoser.pdfIn PDF document text
    • https://s3.amazonaws.com/fapaga/93081462325.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ff3ccb7-d561-4997-a268-3bb7ca4068f7/victoria_secret_employment_requirements.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f4a61d1-c1a2-4912-8586-7b786f3e9047/dracula_bram_stoker_coppola_imdb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34bf2e9d-831d-4c2a-8a78-bb2ae722004e/stata_video_tutorial_free_download.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001132a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132A 5768 bytes
SHA-256: db3e75e10822252b10055fc512506efc978b70cd4a5b7b48ba989f868a2b2d5c
font_01_sfnt_off000126ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126AD 12460 bytes
SHA-256: 255da0c974c0050c4126ad62dbe425c85c4b9c4841d80c09fcc0939e5fc9ce3a

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