Malicious PDF — malware analysis report

Static analysis result for SHA-256 16a1f7eeb61352ac…

MALICIOUS

PDF

78.4 KB Created: 2021-03-24 19:13:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 658e958a043c141af2834f054f161f54 SHA-1: 925ccfef4cac93a9e22c66aaa6298ee339af1c55 SHA-256: 16a1f7eeb61352acd42d0f17d83e13059d9745a6b39135ca949ed7f11729e902
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains heuristics indicating it is a malicious phishing lure, specifically mentioning 'payment agreement' language. It embeds an external URI pointing to 'vilenefex.ru', which is likely a malicious domain. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to a site for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://vilenefex.ru/award?keyword=payment+agreement+letter+between+two+parties+pdf
    • https://pegojuzifaxoda.weebly.com/uploads/1/3/5/3/135309499/9757072.pdf
    • https://putojedenavaxo.weebly.com/uploads/1/3/2/6/132683165/05a77dce7ed.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7f1012c1-f1a2-408f-954c-ec3a2c32e7d0/77157131204.pdf
    • https://s3.amazonaws.com/babetafaperaxov/41695722023.pdf
    • https://s3.amazonaws.com/filidabut/92108270655.pdf
    • https://uploads.strikinglycdn.com/files/d5eaf767-7f77-4fee-b657-3255e4940c33/xogumulukiko.pdf
    • https://s3.amazonaws.com/lusabifef/external_style_sheet_example_program_in_html.pdf
    • https://4be8a7ba-6c9a-47a4-99fc-a5961b41a404.filesusr.com/ugd/132250_0a131e74facd4ba1a61ccbf8e8fc660f.pdf?index=true
    • https://s3.amazonaws.com/napoledunadigo/lesobuzozojidadivitut.pdf
    • https://s3.amazonaws.com/nijudow/catia_v5_64_bit_free.pdf
    • https://08b4a39d-fa16-4eaa-91be-ae90003cacb9.filesusr.com/ugd/237bf7_8da0445a14fc4a7f80c8d2282086e69c.pdf?index=true
    • https://7a1f2a0d-094a-4466-88af-72a4af93b9fa.filesusr.com/ugd/22739b_916f0ee989ad44988f7ca190665b93c0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e1f55b6d-2da5-4d53-879f-7c45e5862f12/how_to_read_random_number_table_statistics.pdf
    • https://s3.amazonaws.com/toguvaju/83209018152.pdf
    • https://s3.amazonaws.com/batiku/71084539264.pdf
    • https://s3.amazonaws.com/pusori/brutal_doom_v21.pdf
    • https://56a7be67-7dca-40da-a973-69ad719fb73b.filesusr.com/ugd/fedf23_cb1ed115e25449c38dd787c1d501a1b0.pdf?index=true
    • https://s3.amazonaws.com/vipuxafol/wanafugekumakogezogab.pdf
    • https://uploads.strikinglycdn.com/files/64cd5903-e73b-4424-ae71-dc35b1237f21/85798421027.pdf
    • https://s3.amazonaws.com/wujixus/the_importance_of_being_earnest_film_cast.pdf
    • https://08c3cc13-1ce0-4add-927e-a3aed263473e.filesusr.com/ugd/ccf397_34179c4776d04920ad213b8183694bd7.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5e6.bin
35d7a5ae4236fd87532664be7665042b4f3600858139a111a92102d5f791e0cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E6 5696 bytes
font_01_sfnt_off0001094e.bin
b74a9a8fcf994c583b7c13d0b9dcaeedeb9e33301f542609b0bee03191c9609e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1094E 10244 bytes

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