Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f44cf0957808358…

MALICIOUS

PDF

80.9 KB Created: 2021-04-22 14:18:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 7f861f34f58ddaa2d6ab29c64f076147 SHA-1: b3208f24f78fbc722ef26c1ef39bbc67fec228f6 SHA-256: 1f44cf0957808358be8a677f3be3b5e6dbdd7a0d46508c73ed01c87cf718720b
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9992

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/strik?utm_term=area+perimeter+volume+worksheets+grade+5 PDF link annotation
    • https://sujumakatu.weebly.com/uploads/1/3/1/3/131379709/4544791.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371267/normal_6003792031fb0.pdfIn PDF document text
    • https://ripumoravoramex.weebly.com/uploads/1/3/1/6/131606135/1475260.pdfIn PDF document text
    • http://xiguzot.22web.org/bloqueo_auriculoventricular_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381105/normal_6007f66aab437.pdfIn PDF document text
    • http://guvetosufawi.22web.org/44964735290.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473902/normal_6042c2ea1b78c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391899/normal_5ff9de0ec8dbc.pdfIn PDF document text
    • https://fogojokiverowur.weebly.com/uploads/1/3/0/9/130969702/luboludewew.pdfIn PDF document text
    • https://kakulekatorud.weebly.com/uploads/1/3/4/6/134681497/ad3cc813cc8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469633/normal_5fd136f70cda6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415309/normal_5fc5d26b8fb05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418180/normal_600bfb478dd31.pdfIn PDF document text
    • https://vilofezilo.weebly.com/uploads/1/3/0/7/130740065/mamaxezuvepet_dokuvovinozegij_suwis.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427313/normal_5fe1cd039a1a4.pdfIn PDF document text
    • http://fosikukiwa.iblogger.org/xanotoxovepupogutadetiso.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://82cb18f6-4a40-4824-ac11-10070f72ce02.filesusr.com/ugd/5aec95_bd78722308434c0d83a0dd90d572c9b1.pdf?index=trueIn PDF document text
    • http://mimosoxokilufaf.epizy.com/ledijawuwuxu.pdfIn PDF document text
    • https://44034db3-6cdd-4729-adf3-7ccd6afcf354.filesusr.com/ugd/9fe9cc_62d61f3e44e6445995cf5ca3a42bef96.pdf?index=trueIn PDF document text
    • https://dd3528e8-ded0-4753-843e-0d3cb9f542e7.filesusr.com/ugd/4d6844_928ca91eeda4473fa637ad19384aa970.pdf?index=trueIn PDF document text
    • https://9fc80a0e-b25b-4135-afeb-9811a1ea6bf8.filesusr.com/ugd/91e123_5ad77b8683c144e99243411f98149061.pdf?index=trueIn PDF document text
    • https://7ec9ed57-df89-401a-953b-45744c150cee.filesusr.com/ugd/6e3131_6e96638093894ea28aca0040d4e0eee3.pdf?index=trueIn PDF document text
    • https://2e907eb7-0cdb-46e5-a4de-ff0e34d1b96e.filesusr.com/ugd/7ea2c5_b4db633fd65c431bbcf4a94ff13bcd56.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_off0000e8ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BA 5700 bytes
SHA-256: c82ccf955067bff4620bb193f1b93f78461bb01075d53b61cc65972efa1622dc
font_01_sfnt_off0000fc08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC08 10520 bytes
SHA-256: 9dae7931e43fbae9334158cc2b6020331c6b7d0652540869fc4ebdbd33e1760e
font_02_sfnt_off00012001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12001 16228 bytes
SHA-256: 4fec1e815ee3416ead281431d11f7a9dc6af0d008a6933652b1c9d51282d4a26

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