Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b5313c4e827b171…

MALICIOUS

PDF

75.4 KB Created: 2021-04-05 10:54:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6d15b02ec32a0aa3454feebfb7191fbe SHA-1: 946caa42db605f9ef829c66afb1f85ec9e5b9566 SHA-256: 3b5313c4e827b1719baedf5c9b4b2455c661d6aabbb94caf10d976bd86dcdb2a
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic flagging it as a 'PDF_SEO_LINK_FARM'. The primary URL, 'https://kuzutuzo.ru/award?keyword=demographic+segmentation+definition+pdf', suggests a deceptive lure related to demographic segmentation. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. While no scripts were explicitly extracted, the PDF structure and extensive external linking indicate a malicious intent to redirect users to potentially harmful sites.

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://kuzutuzo.ru/award?keyword=demographic+segmentation+definition+pdf
    • https://vexepediv.weebly.com/uploads/1/3/4/6/134668456/0e865097f.pdf
    • https://warupotoji.weebly.com/uploads/1/3/4/0/134000388/derojer.pdf
    • https://fugomunufu.weebly.com/uploads/1/3/4/5/134586131/farizis-tilofa-jubola.pdf
    • https://tevoletefe.weebly.com/uploads/1/3/1/6/131606261/vabazilamu_kepabozomitawox_jigozuwutobu_zedumanuxuwogun.pdf
    • https://rimuzomidaz.weebly.com/uploads/1/3/4/3/134353295/dewezagufaxajeguweje.pdf
    • https://lokeduvedip.weebly.com/uploads/1/3/4/8/134885922/foxabagav.pdf
    • https://sasasukaga.weebly.com/uploads/1/3/4/6/134624721/romimisozono.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://528f6e5c-6927-42ef-b7a5-a8f9c349750c.filesusr.com/ugd/07b979_dd50bd0d2a614feeb8b7a696511d26bb.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4f8ae1e4-ca9e-4a89-acba-aae2245e4db1/togarashi_mayo_recipe.pdf
    • https://s3.amazonaws.com/rizezobabub/63734091431.pdf
    • https://s3.amazonaws.com/badodemebo/68154404704.pdf
    • https://d5fb4b5d-766d-4e54-ab1c-ecc61d2b7d82.filesusr.com/ugd/b0c8dc_d6878ad0e03a4fd5975ad6e9ca13fa83.pdf?index=true
    • https://c7bff75e-0a19-4817-9d47-fca4cf08161b.filesusr.com/ugd/3b6424_3cdc7fdd8be941cf98f9bea8de40287a.pdf?index=true
    • https://s3.amazonaws.com/xunilukegez/bazizomowewigiroliva.pdf
    • https://uploads.strikinglycdn.com/files/da585ff3-ba19-45f8-adff-53c872b752cc/tikurejumasigiki.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_off0000e9d9.bin
08ef21272c232c76628df1c2512adb985455a86c09d8443a44a04e44dacdc169		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D9 5536 bytes
font_01_sfnt_off0000fc8b.bin
d28edbf1f928b9c1001944f042f8c71c48b28d2b4c5a2a4d2ef970c58e9e3a74		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8B 10480 bytes

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