Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd52c3c8fe5a50d8…

MALICIOUS

PDF

95.6 KB Created: 2021-05-23 21:02:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: ab9cee19f5442e47db2340a1b223850b SHA-1: 2693940e69c7d38ae741ec93300e42599be2f847 SHA-256: dd52c3c8fe5a50d8b0884c83f71d2cb445e43a959cbee2ac7a83c0e82cba5347
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to external URLs such as 'https://soxebez.ru/strik?utm_term=best+cb+antenna+for+cobra+29+ltd+classic'. The presence of numerous external links, many hosted on disposable domains, suggests a phishing or SEO spam campaign. No scripts were extracted, but the PDF structure itself is used to facilitate the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://soxebez.ru/strik?utm_term=best+cb+antenna+for+cobra+29+ltd+classic PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4461201/normal_5ff3d3ed4fc7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414701/normal_6037f1d4edd35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374843/normal_606e66abe0926.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405895/normal_603cb26e08c76.pdfIn PDF document text
    • https://rofovotojoroko.weebly.com/uploads/1/3/4/8/134878837/4979589.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473919/normal_6063bad748f8c.pdfIn PDF document text
    • https://juduloto.weebly.com/uploads/1/3/5/3/135323899/zimaxib-kevemon-puvogak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411916/normal_5fd90e5bbdc6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480753/normal_601e45625b70b.pdfIn PDF document text
    • https://bonuwokepav.weebly.com/uploads/1/3/4/5/134592975/badojenipasodixofufi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379486/normal_6038e8d172e77.pdfIn PDF document text
    • https://vonorakukipi.weebly.com/uploads/1/3/4/7/134721252/gibojurekux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481539/normal_603b373833b18.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418583/normal_5ff9c6cd7341a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389603/normal_605f33816b0b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369174/normal_601db65417341.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365563/normal_6025c702a852f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390660/normal_6030335705309.pdfIn PDF document text
    • https://fuxiwajusefu.weebly.com/uploads/1/3/4/6/134617271/6272286.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/fixararololu/solving_rational_expressions_worksheet_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/xugigabitulu/bacterial_transformation_kit.pdfIn PDF document text
    • https://s3.amazonaws.com/fadobirak/xufizijanabizadomis.pdfIn PDF document text
    • https://s3.amazonaws.com/redegelesibif/lijawudugisatol.pdfIn PDF document text
    • https://s3.amazonaws.com/pekatikisuruki/xatudazixulafoxaz.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/photoshop_adobe_cs4.pdfIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/raspbian_noobs_install_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/lanaladu/pre_kindergarten_worksheets_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/xupizewuxere/software_developer_technical_interview_questions_and_answers.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011aab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAB 5492 bytes
SHA-256: b52ee255b4b3c22883a8af8420e5b9c3a8fe45ebee530cffb8662f9e198db856
font_01_sfnt_off00012d62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D62 13652 bytes
SHA-256: 23219ab1b02cebb4c00ca2c5eafc204bd3420afa7092114816bd8cfadffec178
font_02_sfnt_off00015b65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B65 16068 bytes
SHA-256: 89247d3646e3773572243f1d4b0449240b5d7bcbc9865045ac28c7845acd9c8f

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