Malicious PDF — malware analysis report

Static analysis result for SHA-256 9190b13a7c18d17c…

MALICIOUS

PDF

72.5 KB Created: 2021-02-15 03:51:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9e9c080bbed42773f8e8f09c03f74c06 SHA-1: bdbbfc4a5d574e7468b4d91e10d4cc63882e8f06 SHA-256: 9190b13a7c18d17c2c069041daf10da883d4e03a6e49722057f21031811a58f2
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent link pointing to 'baarspo.ru'. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://baarspo.ru/aws?utm_term=weekly+class+attendance+template PDF link annotation
    • https://sojujigun.weebly.com/uploads/1/3/0/9/130969910/8531648.pdfIn PDF document text
    • https://vosojexurixug.weebly.com/uploads/1/3/1/0/131070535/jamanep.pdfIn PDF document text
    • https://limazosit.weebly.com/uploads/1/3/1/3/131380555/4092035.pdfIn PDF document text
    • https://pelimabogex.weebly.com/uploads/1/3/4/6/134685965/nariraponakozo.pdfIn PDF document text
    • https://zizonilorixu.weebly.com/uploads/1/3/4/7/134772478/makajo.pdfIn PDF document text
    • https://pizanege.weebly.com/uploads/1/3/5/3/135391653/d66583f596b2bd.pdfIn PDF document text
    • https://boniwivo.weebly.com/uploads/1/3/2/6/132683051/denesovimu.pdfIn PDF document text
    • https://jijemelagif.weebly.com/uploads/1/3/4/0/134016961/moxedokek.pdfIn PDF document text
    • https://kopupoko.weebly.com/uploads/1/3/4/4/134471128/tutorazenav_rixugakujeje_fenuvi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/leveling_guide_classic_wow.pdfIn PDF document text
    • https://s3.amazonaws.com/farokof/6476730826.pdfIn PDF document text
    • https://s3.amazonaws.com/bupijila/rixim.pdfIn PDF document text
    • https://s3.amazonaws.com/bajuse/damejepefulejederipumelab.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/xamejuzajufunuxibunifevi.pdfIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/chapter_5_the_free_enterprise_system_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/murudute/52374341814.pdfIn PDF document text
    • https://s3.amazonaws.com/safenalavojuwu/97134363133.pdfIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/ropoxedofuleka.pdfIn PDF document text
    • https://s3.amazonaws.com/juzinaramip/women_s_underwear_size_guide_uk.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_off0000de67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE67 5300 bytes
SHA-256: 7d093914046fe6264bf21829c34f33caeeeda4e13f84b8fee3c3804574fd0671
font_01_sfnt_off0000f07c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07C 10620 bytes
SHA-256: 80f60eae68720f8c1932d77fcacc7be7c5e5641ef76bc457d21fdc3d0cb2443f

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