Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f5f4407d0ba1b91…

MALICIOUS

PDF

76.0 KB Created: 2021-03-28 12:38:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 72ef8bc7495167e0ba45b0a7a6bb4240 SHA-1: 51315cebfadb1d29b5520213b312c05a62b50e10 SHA-256: 2f5f4407d0ba1b911faf29f0c3363e9b391edf69ec00e29391289c23f2f6ec4d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains a large number of external links, many pointing to disposable domains, suggesting it's part of a link farm or phishing campaign. The primary malicious URL identified is https://mezovuduw.ru/wix?keyword=pig+kitchen+decorations, which is likely used to redirect users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mezovuduw.ru/wix?keyword=pig+kitchen+decorations PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4443801/normal_60287fac67de9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494661/normal_603a29b1d22e6.pdfIn PDF document text
    • http://sportplays.ru/lumomejitarivafah4aq2.pdfIn PDF document text
    • http://beamorem.com/personal_fitness_plan_example_fitt7jptz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427780/normal_604a3dbb371eb.pdfIn PDF document text
    • http://idealica-uficiale.website/63516364061o8zu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gifiz/tovazej.pdfIn PDF document text
    • https://c580675e-8888-491d-8c80-3106eaac86fb.filesusr.com/ugd/c8a981_641c3c7b65254851add3db4ff7add78d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vuxagixil/dopanewemoruxasadisapofag.pdfIn PDF document text
    • https://e97408dc-4b05-4e3b-9f19-f4127feb49ef.filesusr.com/ugd/a42eed_a292e709232e400db5c4b5071449cf85.pdf?index=trueIn PDF document text
    • https://80b1f93a-fe74-4439-a81d-34814fa7a505.filesusr.com/ugd/e56fe2_36f1bcdce8ef4a81bf6fd23b1f72b4e9.pdf?index=trueIn PDF document text
    • https://19aaccd0-9772-41b6-85c4-be118606641a.filesusr.com/ugd/a12125_528dfd558a8847a68e68f4e2a4b52da8.pdf?index=trueIn PDF document text
    • https://b32521b7-32ca-447e-9967-d27d0dce683d.filesusr.com/ugd/800b88_72dd4bcf1a18419a97825fee44db049c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8e81a6d-7058-492d-b924-4a791e344509/death_note_season_2_manga_release_date.pdfIn PDF document text
    • https://f621ecf8-e26c-4db3-9bdf-176eeceb312d.filesusr.com/ugd/b3755e_a5c61ef081fe4aa78401c16fd8e8b6d3.pdf?index=trueIn PDF document text
    • https://3abcc933-4059-444f-8e65-7077e95f005f.filesusr.com/ugd/44645f_5543667da8424288a8a86f4c8377040c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcb85515-55d0-453f-97d6-bd1fa330400e/xikadakunanunitemuxifewe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/403f4428-1db9-4e88-8834-23f20cbffc8c/kuwixibubo.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_off0000ee24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE24 5236 bytes
SHA-256: 26e21efabf726b01c2b84ab50f0b6d3751e94778934839b11b8e082720e8e18c
font_01_sfnt_off0000ffee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEE 10272 bytes
SHA-256: 0aad2ecb57c33767e5cd2db0772b19faee24041a532fedc5e8c8fb84713d2ec5

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