Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6508d43d95f556e…

MALICIOUS

PDF

84.6 KB Created: 2021-04-22 03:03:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 9137fa57ec57d904be036f352b528305 SHA-1: 9c1d7d52c41e99ebcb65b99081e08d34391769b1 SHA-256: b6508d43d95f556ef461b31be9cb221cee15672ef0b088371d3576a9ded6b37a
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://druttle.ru/strik?utm_term=supine+piriformis+stretch+pdf PDF link annotation
    • https://pulakaxumif.weebly.com/uploads/1/3/0/7/130776647/6573f4.pdfIn PDF document text
    • https://nijasofefovo.weebly.com/uploads/1/3/4/7/134719995/5a7f1c.pdfIn PDF document text
    • http://mimedilubaj.22web.org/lefowiguborum.pdfIn PDF document text
    • https://tisexazom.weebly.com/uploads/1/3/2/6/132682329/3864279.pdfIn PDF document text
    • https://vitumiwoz.weebly.com/uploads/1/3/4/6/134697216/fimafugupin.pdfIn PDF document text
    • https://jubamojeke.weebly.com/uploads/1/3/4/4/134432472/2062698.pdfIn PDF document text
    • https://zibesotisudub.weebly.com/uploads/1/3/5/9/135996238/f601d.pdfIn PDF document text
    • https://levoveto.weebly.com/uploads/1/3/4/8/134897684/tupataban.pdfIn PDF document text
    • https://tinutenuku.weebly.com/uploads/1/3/4/6/134664278/fd6ed1892c59.pdfIn PDF document text
    • https://febumade.weebly.com/uploads/1/3/4/7/134757335/f763c.pdfIn PDF document text
    • https://zoviwifave.weebly.com/uploads/1/3/6/0/136053666/3453909.pdfIn PDF document text
    • http://gujejimoge.iblogger.org/liste_abrviation_mdicale.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4bf641bf-117a-4913-931f-55e49063997f.filesusr.com/ugd/5befcb_a81daaf8c7fc43619b6b85b3ec478815.pdf?index=trueIn PDF document text
    • https://8c285b57-3156-47ce-881b-df665acc117b.filesusr.com/ugd/8d46c2_2f8d30cfbd9b45b9b7fe6a567e91aaa2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gofiguj/53668782727.pdfIn PDF document text
    • https://s3.amazonaws.com/zewimu/11499122047.pdfIn PDF document text
    • https://s3.amazonaws.com/sesijesule/algoritmo_en_informatica_ejemplos_resueltos.pdfIn PDF document text
    • https://662517ce-f374-4037-aebd-99b1dbe00103.filesusr.com/ugd/0c4177_93fc5f936b934863a32cb41234126fad.pdf?index=trueIn PDF document text
    • https://b4140449-9b96-4148-8619-c9b3eed7b48c.filesusr.com/ugd/c33cdb_04e9c43214524ae18aa89fef884750fb.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF718 5256 bytes
SHA-256: 88b2917d3e33ec2a9caaedded931056aaf66065b150b10187fffce1f45636840
font_01_sfnt_off000108d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D4 11240 bytes
SHA-256: aeb54091b085abe1fea148aa9d179e1255c7cec618653bc80248a7f6a4133264
font_02_sfnt_off00012f43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F43 16312 bytes
SHA-256: 028dbaa76d48ae99b02248bacea50134e27ed131f5dd39e25ac401de8961e19b

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