Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cb26c10340aa757…

MALICIOUS

PDF

87.6 KB Created: 2021-03-29 00:19:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 8e93d0ed83784022dd0d87a436b27fa8 SHA-1: 1cb6fb3ad72cc072db9b8ab4d12cf94a11326f94 SHA-256: 7cb26c10340aa75738f4db98e76cc18deaa2a455efa6cfc411038c19fa86529e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/award?keyword=a+course+in+behavioral+economics+erik+angner+pdf PDF link annotation
    • http://rapiwanijisage.scienceontheweb.net/89744003167.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380214/normal_601317bcb75dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410216/normal_6036fab8bf52c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421944/normal_600354f8b0c9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369141/normal_60343ad599c5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378855/normal_6056f91a29d52.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://2791e1c6-719d-47aa-bdc5-1556df251b63.filesusr.com/ugd/7757c5_a7bce69fcd914e71a17987d014ca2330.pdf?index=trueIn PDF document text
    • https://ebbb41b5-b8b7-4bfc-9e1b-23e79ad93844.filesusr.com/ugd/5eba67_2778b5b1db604e779318a27cf68f2890.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mixanaz/neonatal_resuscitation_guidelines_2010.pdfIn PDF document text
    • https://1fa67a36-2e8b-44cc-a955-751d80433762.filesusr.com/ugd/d85e51_97574943936e4e6cb39ffa5fedb366b4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/52afe4ce-2da6-42cf-817b-6c68b62c85d2/grim_world_map.pdfIn PDF document text
    • https://cbf60184-924b-4e65-abc2-244eb733ec12.filesusr.com/ugd/9a25f9_b288846973ff425e8d42bf6b40561aa9.pdf?index=trueIn PDF document text
    • http://safedoguno.onlinewebshop.net/argumentative_paragraph_definition_and_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/200a86e0-6822-4a6a-acb1-c5fe480c3769/zikiwudeboredigodalojus.pdfIn PDF document text
    • https://s3.amazonaws.com/sefepugolupalax/9014574495.pdfIn PDF document text
    • http://widepidaba.atwebpages.com/55535632014.pdfIn PDF document text
    • https://s3.amazonaws.com/setigafat/gravity_falls_opening_piano_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c6baf99-6c0e-4810-a28f-51b497dcdf95/mosutupofomekoxizimaxediw.pdfIn PDF document text
    • https://s3.amazonaws.com/gosete/magapimiporaberusojij.pdfIn PDF document text
    • https://6d4a8fb0-9a8a-4850-8aa1-2b5706121c9a.filesusr.com/ugd/ff2e72_5c4a996a83be4cbdb8590d02b6abf41a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/74c2b68b-d06e-42bc-8ccc-8c2a191b520f/webixukawenob.pdfIn PDF document text
    • http://letutemoxeluz.onlinewebshop.net/anatomy_of_human_body_bones.pdfIn PDF document text
    • https://1ac5d900-0c69-4f12-8b1d-4e209472b8d2.filesusr.com/ugd/828753_39f16df3036c4650beb8978453fc14f5.pdf?index=trueIn 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_off0000f510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF510 5624 bytes
SHA-256: 07f3bddb7805b98986a9896b3c29b826e8916c7264d1ac835ab3d02d453a1fbe
font_01_sfnt_off000107f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F3 10852 bytes
SHA-256: 28c447a249933265e8ef55fee5e41a71e4ec3d41d13b30aa829c2c34b30c7862
font_02_sfnt_off00012d63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D63 16084 bytes
SHA-256: 462d13bd97d7d9b38b38dac4ddb889f891d4742debcdf3bbf084b15d68e01d41
font_03_sfnt_off00014219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14219 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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