Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d0e4eccb6107377…

MALICIOUS

PDF

75.4 KB Created: 2021-05-25 01:03:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a98265f472387cd95ad90adfb4e1c8b7 SHA-1: c094282096e04128b61c109d604b0b73c8cf51b2 SHA-256: 1d0e4eccb61073774064938ad1292d45e6494957d7a50752fe84cf905f4737b2
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution attempt, likely leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://nipisod.ru/strik?utm_term=how+to+make+strategy+canvas PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4425229/normal_60150302b9d02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378623/normal_6015ff2b9e995.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419637/normal_6069f7b741110.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455894/normal_6005e1f2a6ca8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452381/normal_5ff7093e918e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452392/normal_5fd5f56d6f63a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416490/normal_6061d9a4223af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471467/normal_605f8c3faf922.pdfIn PDF document text
    • https://gekafokolasiga.weebly.com/uploads/1/3/1/3/131384301/6746631.pdfIn PDF document text
    • https://gakezepatirana.weebly.com/uploads/1/3/2/7/132712251/kusizugefezadaledej.pdfIn PDF document text
    • https://lefizedut.weebly.com/uploads/1/3/2/6/132681647/834818.pdfIn PDF document text
    • https://buzomuzugagi.weebly.com/uploads/1/3/4/3/134313884/f07d3da215b.pdfIn PDF document text
    • https://zazokovorif.weebly.com/uploads/1/3/4/3/134321981/xupipezug_sanowedizuru_nefebuku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470221/normal_600de08d2f1e0.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/01949398-5b19-4d45-bf97-19300bf42808/kexetavaxupupogijoluro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63bd6730-0f2a-47e4-835d-b8e399ae6e17/91240225400.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/173036c6-a5ec-4cf9-be4c-24929f9a6a4d/ff7_guide_download.pdfIn PDF document text
    • https://s3.amazonaws.com/neporezofov/mafazoraxan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/290f5272-2066-4f33-8832-e453b1652d2d/sefewiwuvuxopur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db51046a-1486-46cf-908a-10b234592671/vavubafutagugizu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ec381c0-678a-456c-9a55-3e485e1c1197/rofifomiragalapujavi.pdfIn PDF document text
    • https://s3.amazonaws.com/dujepav/sheet_music_symbols_crossword.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4703f9f-4f45-40b4-9573-c462ef25f5c5/60348285212.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/how_much_is_the_bbg_program.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_off0000e99f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99F 5368 bytes
SHA-256: 19575354fe9d22e155292d497dfbd999ce24f656cb3ca9ea62303234f59f6791
font_01_sfnt_off0000fbe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE6 10696 bytes
SHA-256: c0fcce17bc2a2e325ce56cc352c64abcd01c3df7c0a3053167109ae985edb45b