Malicious PDF — malware analysis report

Static analysis result for SHA-256 44243e328bbccb4e…

MALICIOUS

PDF

78.8 KB Created: 2021-03-26 17:39:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: f554c238b219acc0399fcb0af0893206 SHA-1: 05385a12e777a8fcbc03e08d955025b7bd9c7e79 SHA-256: 44243e328bbccb4e0da8c4436501f98a7cdedaed33cac154504f548fc0adb16f
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links pointing to other PDF files hosted on disposable domains, a common technique for distributing malware or conducting phishing campaigns. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs and the link farm heuristic suggest the primary purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/123?utm_term=xenoblade+chronicles+2+guide+book+pdf PDF link annotation
    • http://wojesukuzak.mygamesonline.org/besiwujoxazu.pdfIn PDF document text
    • http://instgramcopyrightdispute.com/70962594104whjkv.pdfIn PDF document text
    • https://nurigefisigutip.weebly.com/uploads/1/3/4/6/134628418/10c39d734d9d.pdfIn PDF document text
    • http://1green.space/zetodipalusokigotujajug6d5g3.pdfIn PDF document text
    • http://detonic-deutschland.website/24305786951fxf63.pdfIn PDF document text
    • https://metekazup.weebly.com/uploads/1/3/2/8/132815755/rokafuxozozona-tilolomujemore-jifeb-potoruleseguz.pdfIn PDF document text
    • https://xejibojap.weebly.com/uploads/1/3/4/3/134310503/456e82fb4a6c.pdfIn PDF document text
    • http://apsdd54gfv.xyz/xunavamumutuwekubekabedizq8yuc.pdfIn PDF document text
    • http://kikababono.mywebcommunity.org/nc_written_drivers_license_test.pdfIn PDF document text
    • https://xonarupitowij.weebly.com/uploads/1/3/4/6/134617661/dadugutunasaji.pdfIn PDF document text
    • http://dwatches.site/vizio_m50-c1_t_con_boardhr85b.pdfIn PDF document text
    • http://profer-opt.ru/dujenabolunevebofipig4s9sz.pdfIn PDF document text
    • https://xefolulewonud.weebly.com/uploads/1/3/1/4/131406676/panovaper.pdfIn PDF document text
    • http://center-about.com/basic_engineering_circuit_analysis_10th_edition_solutions_chapter_6x7a3t.pdfIn PDF document text
    • https://fiwugepupuladav.weebly.com/uploads/1/3/4/7/134740110/demox.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://711a90e7-97f2-4eab-8690-3003ec1e9b64.filesusr.com/ugd/a0905b_b233e573de74451dbaa16de33754b910.pdf?index=trueIn PDF document text
    • https://1e16da7b-5b4f-4122-a3c4-5c88c9d97cf7.filesusr.com/ugd/83f04e_39594f400e994f3d9d306277794af2ff.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e13d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13D 4644 bytes
SHA-256: 8796f8fe992bfdab570dd78be4bfda9784362ad04b23459ed0f84db97a424d11
font_01_sfnt_off0000f15a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15A 5728 bytes
SHA-256: ad15d1f538004de2b404e6f441b99dd578b831e56fe6caa50d4cd9f4191af2ea
font_02_sfnt_off000104ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CE 11968 bytes
SHA-256: 2c6b61ad982cc24f27b3b6bb56af30d0cfac6f9d348064a34662855148e71187

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