Malicious PDF — malware analysis report

Static analysis result for SHA-256 16f53067fe8bcaa2…

MALICIOUS

PDF

82.4 KB Created: 2021-03-22 00:50:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e7074eb8fe2ebb15a2101c067cc39887 SHA-1: 7e064b4c152e5c6510c7d8e162444bb7a4814c59 SHA-256: 16f53067fe8bcaa24abc75ab1615cd548fac73fd0b5d39f80a73202f7c96afdb
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of a large number of external links, many pointing to PDFs with numeric slugs, suggests a link farm designed to manipulate search engine results for phishing or malware distribution. The primary malicious URL identified is https://jottigo.ru/wix?keyword=behringer+v+amp+pro+manuale.

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://jottigo.ru/wix?keyword=behringer+v+amp+pro+manuale
    • https://static.s123-cdn-static.com/uploads/4443342/normal_5fc9b21d3a289.pdf
    • http://c-advance.space/lyft_roadshow_presentationcvyds.pdf
    • https://cdn-cms.f-static.net/uploads/4366319/normal_603f21226d665.pdf
    • https://supipujijasof.weebly.com/uploads/1/3/0/7/130739476/5636989.pdf
    • https://static.s123-cdn-static.com/uploads/4369501/normal_5fcb2b7d97266.pdf
    • http://winfreeiphone.xyz/944789323332txgt.pdf
    • https://static.s123-cdn-static.com/uploads/4390329/normal_5fc98c5fcbdbf.pdf
    • https://piworanup.weebly.com/uploads/1/3/2/6/132681558/3ee2f.pdf
    • https://tufelovewojamex.weebly.com/uploads/1/3/4/3/134331554/dawun-wokeridizulur-sujom-darun.pdf
    • https://static.s123-cdn-static.com/uploads/4455380/normal_5ff411bee41d0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f4358e98-da51-417b-8a21-93baa4312f28/51889774091.pdf
    • https://e9593579-f51f-4dc6-af55-2543ab512b45.filesusr.com/ugd/37952c_5c9b0028cbc449d69bc7eb97436d5a47.pdf?index=true
    • https://f1e11ea9-a931-46ad-af30-391325c877dd.filesusr.com/ugd/423518_ef6b25a694c04753bc785ad4423b45e4.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8cd84be8-0cb1-4b6f-bcdb-e25ccb501aaa/79671572176.pdf
    • https://uploads.strikinglycdn.com/files/e56b3d1c-41c3-4214-a36d-8f1ad1a2fc44/navy_seal_training.pdf
    • https://uploads.strikinglycdn.com/files/dc955d2c-d44d-4dc3-83cf-77c3c1811a27/lg_ac_error_code_ch_23.pdf
    • https://uploads.strikinglycdn.com/files/fd4ad98c-f08e-4a85-bd42-7cce5c236fca/barasutekurigeraworasuril.pdf
    • https://uploads.strikinglycdn.com/files/a89539b5-4827-4e77-b1bd-d5e69e5565c1/interview_questions_for_preschool_teacher_aide.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_off000106f2.bin
51c4966a17b21857fd5b8713fd96658b70010a3be125fba56d081b33e9dda626		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106F2 5164 bytes
font_01_sfnt_off00011861.bin
61d5b96f2ab2918091ad4f9fe9f5616f1e5df3db816309504cde46b4108a3370		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11861 10964 bytes

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