Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6daed0696dca54a…

MALICIOUS

PDF

73.3 KB Created: 2021-03-25 10:05:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ad2e22b629f41f369443294a6a8908db SHA-1: a30a52e4546e55b2dfbea79cbcc0aa55d32359a8 SHA-256: c6daed0696dca54a4bc70f132dd1e954f2c448347fdefa831dfa250253842a11
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, including one pointing to 'resalured.ru', suggesting a link farm or phishing campaign. While no scripts were directly extracted, the PDF structure and embedded URLs indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/wix?keyword=worksheet+compound+sentences
    • http://takimopunize.22web.org/vubadizut.pdf
    • http://boketizabujig.scienceontheweb.net/statistical_analysis_of_rainfall_data.pdf
    • https://cdn-cms.f-static.net/uploads/4408721/normal_600fc2daa2322.pdf
    • https://cdn-cms.f-static.net/uploads/4444884/normal_60459d1ade458.pdf
    • http://dosaxixapaxa.medianewsonline.com/85775553491.pdf
    • http://nemosixumeki.mypressonline.com/parabody_350_workout_chart.pdf
    • http://luvatok.66ghz.com/contabilidad_de_costos_definicion_e_importancia.pdf
    • https://cdn-cms.f-static.net/uploads/4379732/normal_603069b3c72a4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/7d9a66ff-319f-43de-9c5b-8934716aa34a/87808527363.pdf
    • https://2f2ab42d-e0b4-4bd3-aa50-2430da1ff5fc.filesusr.com/ugd/eaf48f_99f8ce062814496d8720dfe6b05b397a.pdf?index=true
    • https://69b3109a-7cce-4514-9193-d2106d9976ab.filesusr.com/ugd/3c2969_f96cab5ddc4840e3b048c7a7cc70dd79.pdf?index=true
    • https://6f8cb219-4830-455d-9ced-b55e65700e85.filesusr.com/ugd/fd30ac_cf6e32ea76fd482c8c7af881a7fa1843.pdf?index=true
    • https://e8b83640-91e4-44a0-a69f-c2468797902f.filesusr.com/ugd/ee4a13_110dc787f0e34157b9565fdfc3987095.pdf?index=true
    • https://67a4337f-2b79-4d04-9c1d-2578c80f4945.filesusr.com/ugd/964009_446f22808e34463d8f65603207e1472a.pdf?index=true
    • https://93dbb2ad-f1e8-4c6c-adfd-2ef134399473.filesusr.com/ugd/df4650_3a8dd6f52b6943eb958c72430771b563.pdf?index=true
    • https://1a6defe7-92a0-4357-8a70-d3bce85d30c9.filesusr.com/ugd/385065_bea2c2a087d242f79e5eb3ea9e2330b3.pdf?index=true
    • https://uploads.strikinglycdn.com/files/cc8bd131-bad9-405e-9817-5c944d203aa5/tepofiloloxanulijadofu.pdf
    • https://uploads.strikinglycdn.com/files/11421e76-944f-447d-9d6c-0a6278287f11/basic_math_worksheets_for_kindergarten.pdf
    • https://48bf584d-d56c-45cf-b4f3-c1c05dce5274.filesusr.com/ugd/3f4b99_1a523881429d4b4887ee8b71bb9015a6.pdf?index=true
    • https://1423d76f-a56f-4481-bf87-726e17039346.filesusr.com/ugd/14aee2_78e3558f561b4365b58a41063071ef23.pdf?index=true
    • http://jubogaju.atwebpages.com/las_tecnologias_de_la_informacion_y_comunicacion.pdf
    • http://zulolabopel.myartsonline.com/calisthenics_workout_plan_advanced.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5a3.bin
204d6f04e3d12e6619efa530189e3316122025ccfd571256acc7b5821044f7a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A3 4984 bytes
font_01_sfnt_off0000e67b.bin
cc669a812246f4365f2f6e420e4d9880575df1e97d04bba3508481dde9701567		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE67B 10408 bytes
font_02_sfnt_off00010a07.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A07 4324 bytes

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