Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe31c6d12d1f2aea…

MALICIOUS

PDF

102.5 KB Created: 2021-05-22 20:36:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 2d3a1b59cbaab5d8d62c4a243b06c0c3 SHA-1: c198401de49f424f16905dd00278a48373b9a7db SHA-256: fe31c6d12d1f2aeaeaaa74ea0c28d27c9b54056c7d9790e82c8ba2797921c459
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The presence of a URL with a 'utm_term' parameter and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicate a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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=acupressure+points+chart+in+hindi+free+download PDF link annotation
    • https://tagopudul.weebly.com/uploads/1/3/5/3/135392217/suvikelelogix.pdfIn PDF document text
    • https://baziwiruxufuwav.weebly.com/uploads/1/3/1/4/131482892/7bb03.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407788/normal_5ff23a85b9d5b.pdfIn PDF document text
    • https://zoxofaduw.weebly.com/uploads/1/3/2/6/132683138/232832.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370052/normal_601287913efce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393361/normal_5feed7736f690.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365626/normal_5fc6582c831c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486742/normal_604718ddd86e1.pdfIn PDF document text
    • https://biwawabagukolaz.weebly.com/uploads/1/3/4/7/134730268/8373136.pdfIn PDF document text
    • https://vosuxawa.weebly.com/uploads/1/3/1/1/131164537/8700578.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn 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/4e3bbc15-57d3-4e63-85f5-6caaef41f7fc/rufozenobawudepaxof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9e8a140-3777-42f6-8f5b-a1b9c4509c1e/jifival.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/020b4713-1f68-4bdb-a034-7899d44a960f/24710830671.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcf542f7-124d-4043-a92e-bdfa4264a1cd/nepibimigorovigafup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c38250b-c596-4d10-a049-b88cc4f284b5/805803019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc665092-48b1-47f9-805b-233ec638f706/38738988926.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45dafe13-ba47-4da2-9a7c-86f6436f8ff6/4923029610.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ba4b717-ade9-4670-877a-5bd333b44e38/92521461940.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3df47b3-7c71-4ae1-aa64-57b5fe2766c7/mumexitafolobuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95844243-e969-4354-9894-1eb50957e805/how_to_set_time_on_tissot_touch_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/614e9f64-2ee4-423b-80c1-44e1be93bc48/tideri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cefc875-21dc-49e1-8365-637b34d0a491/vufedimiwetamo.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000155d3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x155D3 18040 bytes
SHA-256: 4ecb647f8443a79541324a8a51802e4f71dc5d4afcc8076a04b3e2ced56cee92
font_00_sfnt_off00011653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11653 5324 bytes
SHA-256: d0380ff88f2488fb53601628cf0348c75d0be420ea4c9211c234999f8087695d
font_01_sfnt_off0001287c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1287C 3720 bytes
SHA-256: d5ecec3e822993868ba70e247019bcdb656a9fee58d620eb93bc70658e929280
font_02_sfnt_off000133de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133DE 9860 bytes
SHA-256: 8cd01cc314d652538234e70dc5b2d2386e1b1f9b0ac17c277345faa2ee9d7a90

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