Malicious PDF — malware analysis report

Static analysis result for SHA-256 59db2b2f7968e4c9…

MALICIOUS

PDF

75.7 KB Created: 2021-04-17 02:50:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: be1b8b20e272acafb59fabcb0f82d117 SHA-1: 2e3c032a728f9122379a86b11519b6bf00e2ec2d SHA-256: 59db2b2f7968e4c93ad11ae8e3669a8f390cf79fa3959789e4f0f7f5cfde595d
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. The document body, though heavily obfuscated, contains references to 'Tl wr841nd configuration', suggesting a lure related to network device setup. The presence of numerous external URIs, including one pointing to 'nipisod.ru', strongly suggests an attempt to redirect the user to a malicious site for further exploitation or credential harvesting. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/strik?utm_term=tl+wr841nd+configuration PDF link annotation
    • http://gexomafe.mypressonline.com/dudolelidasun.pdfIn PDF document text
    • http://fejekadiwoxobiz.getenjoyment.net/89661122748.pdfIn PDF document text
    • http://kudikadip.getenjoyment.net/altivar_312_trke.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kulebosux.myartsonline.com/adt_cellguard_for_pulse.pdfIn PDF document text
    • http://nujebij.onlinewebshop.net/flash_430ex_iii_rt_manual.pdfIn PDF document text
    • https://c4bedd8b-a3e9-4aa8-9751-a6fde4035b7e.filesusr.com/ugd/037f08_6e0be81ce5ad44f7960ba77da186d8a0.pdf?index=trueIn PDF document text
    • https://8aa13d94-a051-4bfa-911d-5e7c2f772018.filesusr.com/ugd/382cc4_fb88a792a7b042d09928a66ca4305aa4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/925ac705-7067-4f63-b684-dbdaf863861e/julezobajur.pdfIn PDF document text
    • https://s3.amazonaws.com/vufupu/79960425636.pdfIn PDF document text
    • https://s3.amazonaws.com/nagudo/29183707558.pdfIn PDF document text
    • https://s3.amazonaws.com/kumasala/29029016479.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b6005f0-5ae1-4985-88ca-8352daeeab5e/thermaltake_power_supply_tester_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a45e65be-95eb-46b1-9e13-a90e6b3085f5/best_leaf_blower_vacuum_mulcher_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/543a4715-fdea-4c7e-a379-d8cc9a2a3c77/72446816701.pdfIn PDF document text
    • http://perexuwofogefo.onlinewebshop.net/cherub_brigands_mc_download.pdfIn PDF document text
    • http://wowutuzineko.myartsonline.com/dell_optiplex_760_ram_support.pdfIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/7326382337.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5279380b-4ca0-4a3b-b981-f50e391c6bdf/wosekirasuxolawi.pdfIn PDF document text
    • http://tujupifirafadus.myartsonline.com/73659619550.pdfIn PDF document text
    • https://b6c9d0de-81a1-4db9-ab7d-8a95af9e63d6.filesusr.com/ugd/b28ae2_c0b9862da76c47afa1be199ff902eb04.pdf?index=trueIn 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_off0000e7e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E9 5384 bytes
SHA-256: e3283fdfc534131114cdc847ad0f18f8fa7e86de1e7a4077fab1bff2f13073db
font_01_sfnt_off0000fa66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA66 11224 bytes
SHA-256: 196ad248920ed75e2c691e162df1a281be4220151f5f1195bfbd2131ac722eb3

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