Malicious PDF — malware analysis report

Static analysis result for SHA-256 31e5b8806a0d33e8…

MALICIOUS

PDF

69.8 KB Created: 2021-04-30 11:50:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5ddc328eceba4b78818fec528d1d9a9d SHA-1: 5414bf99a507ef33d45bc49cdc110b3dfef0c1ab SHA-256: 31e5b8806a0d33e8c36e3ff5452716e1cac006528d487099482c84e0cec9425f
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, indicating a link farm or phishing attempt. The heuristic PDF_SEO_LINK_FARM firing suggests the document is designed to direct users to a large number of external PDF files, likely for malicious purposes. The ML classifier and ClamAV detection strongly indicate malicious intent, with the latter identifying it as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/strik?utm_term=discourse+on+the+origin+of+inequality+pdf
    • http://reduslimitaly-official.site/pumovusidalibeduga1joj0.pdf
    • https://static.s123-cdn-static.com/uploads/4485301/normal_60054219abe47.pdf
    • http://kapusta.pro/concrete_mix_design_procedure_as_per_is_code4sjqw.pdf
    • http://pshcomonhere.xyz/10072874847fw6lj.pdf
    • https://cdn.sqhk.co/famagafe/jdtFjb3/29946832547.pdf
    • https://cdn.sqhk.co/retagigimusa/jljcunh/redbox_movies_coming_soon.pdf
    • http://rafale.store/19351576074aphpx.pdf
    • http://mediaverifiedbadge.com/crystal_reports_9_fullhcrek.pdf
    • https://cdn-cms.f-static.net/uploads/4366969/normal_60656e3c3c4f6.pdf
    • http://wenevaveredanib.22web.org/does_corn_on_the_cob_have_many_calories.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://rajemezipuz.rf.gd/35599796941.pdf
    • https://183df7f2-4185-4ca0-bfcc-33b39bc842f1.filesusr.com/ugd/9ac34a_6d67aa13b2e34ad898cfa0abb3d4a95b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/fd7befac-7da8-48bf-ae78-a8b8c3595f0b/32095655041.pdf
    • https://uploads.strikinglycdn.com/files/2f7dd7ed-fe1d-4e74-b418-68a1a6d3e455/catch_me_if_you_can_trailer_youtube.pdf
    • https://uploads.strikinglycdn.com/files/96c132d5-3749-4714-ad3b-939fdbf10dd2/rufejujo.pdf
    • https://uploads.strikinglycdn.com/files/29c0177d-4653-490c-a3bf-0700c9ed175b/is_the_cissp_exam_hard.pdf
    • https://3e3188f7-d9e9-48da-9af6-4e6760718ee0.filesusr.com/ugd/4f7562_ff2578813056451787f76f6fc9e78635.pdf?index=true
    • https://uploads.strikinglycdn.com/files/43366f87-cac0-4c7f-bbf3-b05bfb55cbd9/11829518645.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3bf.bin
0e3daea7c5405b07b9945a25979fa2bc5ebb40fdf2daf3fc92e10cde8867a447		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3BF 5644 bytes
font_01_sfnt_off0000e6f6.bin
07e677abe5b7f80eb64c7815052354572803a203da33172c9ba2d4e77e19bf34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F6 10404 bytes

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