Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8b335e1916fe6dc…

MALICIOUS

PDF

85.9 KB Created: 2021-03-30 19:48:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 401acfb89d591b4f1e0c891f42ef106b SHA-1: 6f22d129202ebda071ab508920678db76b768e77 SHA-256: c8b335e1916fe6dcb51cc6b6cdfe2ecd3a6ba69dc700ef7294f8bda6a09d5e10
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to Weebly and other free hosting services, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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.
  • 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://lozipotod.ru/wix?keyword=multiple+alleles+crosses+worksheet+answers PDF link annotation
    • https://sawonelezaxiso.weebly.com/uploads/1/3/4/5/134588179/videne.pdfIn PDF document text
    • http://joxezorov.mywebcommunity.org/bodukajuvirepulozewakevar.pdfIn PDF document text
    • https://cdn.sqhk.co/foseziwate/jcieiib/sexezo.pdfIn PDF document text
    • https://cdn.sqhk.co/kenipafitu/dBhdyH5/nogirida.pdfIn PDF document text
    • https://cdn.sqhk.co/sewetotab/DAVjehh/minejajonepikikiduwud.pdfIn PDF document text
    • https://satiwumufov.weebly.com/uploads/1/3/4/7/134724604/bodumofanatipiro.pdfIn PDF document text
    • https://fanazogi.weebly.com/uploads/1/3/0/9/130969494/2eae8694a60b2d2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373511/normal_5ffc3389b9799.pdfIn PDF document text
    • https://cdn.sqhk.co/vetedaxuzele/h5hbJAi/chicken_invaders_5_download_full_game.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450251/normal_601f71006d2ca.pdfIn PDF document text
    • http://gajelifuluxapov.mywebcommunity.org/food_chain_worksheet_3rd_grade.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413235/normal_602f0cd86cb3b.pdfIn PDF document text
    • http://julivojurukumu.sportsontheweb.net/povonovapo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477400/normal_601cb1b7a60d0.pdfIn PDF document text
    • https://cdn.sqhk.co/puwupasakej/bsyjcgj/theme_park_island_mod_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/divexikav/ireport_5._6_0_windows_installer_exe.pdfIn PDF document text
    • https://s3.amazonaws.com/dudurat/87700875269.pdfIn PDF document text
    • https://s3.amazonaws.com/dozore/criminal_injustice_lawyer_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/tofizo/python_3._7_64_bit_windows.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/bitdefender_antivirus_for_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/siwixomudit/free_pascal_cho_windows_7.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE8 5064 bytes
SHA-256: e74d7189448861c44e82944956a58bc78b76eaa76411edb31e1f0bd13e44c10c
font_01_sfnt_off00010023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10023 10712 bytes
SHA-256: bfde2859f263b4b1cde3f9ddd6f64ac300a51601cd16ce438d25c4c48e57635a
font_02_sfnt_off000124df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124DF 16092 bytes
SHA-256: e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848
font_03_sfnt_off000139a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139A7 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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