Malicious PDF — malware analysis report

Static analysis result for SHA-256 f19ae5e2436db8fc…

MALICIOUS

PDF

83.0 KB Created: 2021-03-05 19:41:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7a74246dba7f54a218d7c4460d34bf94 SHA-1: 3d0993e7eab2c001803d1c53ffb16a21ffc2daec SHA-256: f19ae5e2436db8fc4c5785bb2d58c388a5eeb42d593f23b19a0b9bfb5a1bd1f2
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://dugedepap.ru/award?keyword=el+peque%25C3%25B1o+vampiro+2017+online+latino PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365612/normal_5fd7a9e935b0c.pdfIn PDF document text
    • https://kunotokadi.weebly.com/uploads/1/3/1/3/131379116/matosepepezef.pdfIn PDF document text
    • http://bovosidifusu.iblogger.org/zofapavezop.pdfIn PDF document text
    • https://sesumevikenaful.weebly.com/uploads/1/3/5/3/135346106/movafijoris.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393624/normal_5fe54ae6bb101.pdfIn PDF document text
    • https://motodamoz.weebly.com/uploads/1/3/1/4/131452818/69a2853131.pdfIn PDF document text
    • https://vifusixediw.weebly.com/uploads/1/3/5/3/135312005/1624701.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481663/normal_5fd662839661f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447906/normal_5fc9e38a48ec0.pdfIn PDF document text
    • http://kuvofejom.iblogger.org/81357555922.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407087/normal_60180f22259fb.pdfIn PDF document text
    • https://sonikimejikelo.weebly.com/uploads/1/3/2/6/132681145/157c569cc407.pdfIn PDF document text
    • http://govusinixarimi.iblogger.org/92928592238.pdfIn PDF document text
    • https://simepatu.weebly.com/uploads/1/3/4/2/134267103/pivatup_xibazasoxe_zojivizujuti.pdfIn PDF document text
    • https://vewiwuxipax.weebly.com/uploads/1/3/2/6/132681682/difuvas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8a89c5bc-485b-4808-980c-66c60e8d9908.filesusr.com/ugd/834936_21c7ab1dbfd74cdfa227df269f9ca42a.pdf?index=trueIn PDF document text
    • http://guxozuzemonixe.epizy.com/jdk_1._6_64_bits.pdfIn PDF document text
    • https://1fc3e790-19e1-43b7-bae7-d09a953f51fe.filesusr.com/ugd/2c608b_7a9028f46df149cca06f157da279ae37.pdf?index=trueIn PDF document text
    • http://dodarululi.epizy.com/fisuwefube.pdfIn PDF document text
    • https://1cdd1dcb-54a5-4750-95ad-c4cce9a68cd1.filesusr.com/ugd/1e32c2_3ee4d7d1904240be90f3d0237079d264.pdf?index=trueIn PDF document text
    • http://somolif.rf.gd/apple_developer_ios_human_interface_guidelines.pdfIn PDF document text
    • https://30b7a97f-6117-4fff-8876-4b3c2220b6c6.filesusr.com/ugd/15cd4d_aecf8b14ebe14cb5ae96d8ab3e86db8c.pdf?index=trueIn PDF document text
    • https://4f65501f-cdae-4966-b9db-49b15ad9d196.filesusr.com/ugd/52b593_ea8544f196774bdb889c50c5ff8e4da6.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_off0000f07f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07F 5548 bytes
SHA-256: ba2a8512a53236251b2900eb3c608a6c2625fa167c3df722ff81593cabfe02fe
font_01_sfnt_off00010319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10319 11080 bytes
SHA-256: f2851432fa7ad28e3dac520064f56dd68109d56fa4e251c3667df1807b7853d0
font_02_sfnt_off00012777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12777 16036 bytes
SHA-256: 354dce64f07f3d7acdf6a04edf763950ffbfec4edcbb4bfe17b65a83544077bb

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