Malicious PDF — malware analysis report

Static analysis result for SHA-256 087045dcc9319ca5…

MALICIOUS

PDF

76.8 KB Created: 2021-03-10 23:46:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 466bd5f0da5f37a1a1ffaeecc0011196 SHA-1: ec459f7e1e09a38c747915a1b635d38dd5314dbd SHA-256: 087045dcc9319ca55c07c7f1cbd7845645572bc6b5cb92eb1539394b71570141
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous external URLs, with one specifically pointing to a search query on 'leonvi.ru'. This suggests the document is designed to redirect users to potentially harmful content or facilitate SEO manipulation. The presence of multiple external links on disposable hosting further supports a malicious or spam-related purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://leonvi.ru/wix?keyword=springboard+precalculus+unit+3+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4501042/normal_5fcecbeb2319d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481270/normal_5fcafb3763389.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404122/normal_5fdd851d0befe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403264/normal_5feb96499f3e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483591/normal_60397a8d93688.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366027/normal_60018355876d8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406771/normal_5ff803dd8f520.pdfIn PDF document text
    • http://rowexusaje.mypressonline.com/dancing_at_lughnasa_synopsis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456685/normal_602ee02077535.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490961/normal_5ffb788d5b3c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424027/normal_602fb1b24e7ac.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcdbfd39-49dc-405f-9941-9ef4e421214b/nexanofevufafisanuzefar.pdfIn PDF document text
    • https://0fc0baf9-b884-4fcd-968e-f93c0f938930.filesusr.com/ugd/68ec51_755689ad300845d7aca5a3e0e7ef2d67.pdf?index=trueIn PDF document text
    • https://3e1ae61b-6b68-46dc-8a90-d1c7a5b9f91c.filesusr.com/ugd/b8bbd7_2e9b2cdc39464450b89b72ac9e83bb06.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0dd4839-ee97-49fd-8bba-feb4b3149a95/gevizanafegide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09ecb271-6b4a-4a16-95ff-7983c7f730af/30222532946.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b674c38f-47c6-4494-ae74-32fae74beef6/boy_scout_shop_tulsa_ok.pdfIn PDF document text
    • http://lejiletuvasipib.onlinewebshop.net/why_my_briggs_and_stratton_wont_start.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f924a159-aff3-4e4c-8e9f-5562b4bda596/what_is_ozymandias_about_poem.pdfIn PDF document text
    • https://8533cbf3-c0d6-400c-bdf8-8ca38cf0242b.filesusr.com/ugd/135178_14c0cd8240d44e4fad86893c6aa2b067.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/98379937-9b83-4018-96c0-21876913f73b/english_101_classes_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/969471ec-c92e-4218-84ec-90e35b8efd20/pirates_of_the_caribbean_sheet_music_piano_free.pdfIn PDF document text
    • http://jumepenitujox.atwebpages.com/what_is_the_highest_level_of_six_sigma_certification.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f65efb0b-3056-4f13-9f49-05589c8bb254/75904883423.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7a53b51-321c-4128-bb92-781d58a4aabb/the_dark_tower_2020.pdfIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED28 5740 bytes
SHA-256: 43002a71eea875361d0862d677a899229fea3fff6130bd8babb9dd88b54d8ca1
font_01_sfnt_off000100cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CC 10728 bytes
SHA-256: d580ceb8c51d2ac02df55c158aaeb2e82eca4e6401c831f19f275ef9a839c80f

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