Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2ae5efbbe894a45…

MALICIOUS

PDF

95.4 KB Created: 2021-06-04 01:29:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 675c0e95d61ad9974d647a562b7cd4f8 SHA-1: db2f764567793571527ee866db87f0e6b62e2833 SHA-256: b2ae5efbbe894a454fa9bbc206726410ff41c3f87b018d158bbf70c9b9c9353b
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating it functions as a link farm. This is a common technique for distributing phishing lures or directing users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://jumiwimov.ru/123?utm_term=balanceamento+exercicios+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485299/normal_60614367824b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386073/normal_606da60b8f427.pdfIn PDF document text
    • https://nozezekotelipub.weebly.com/uploads/1/3/4/8/134883262/lediwok-lozuxakejos-vubuxata-buwuwewobuva.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502248/normal_605280fd4c264.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424036/normal_5fefac8734266.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491168/normal_604e215c97416.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452206/normal_603bad3de5540.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445101/normal_600f7800c47ee.pdfIn PDF document text
    • https://lavafijaxeb.weebly.com/uploads/1/3/0/7/130740432/vazuwufudex.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4404740/normal_60b1d1c7a10d8.pdfIn PDF document text
    • https://sanufelileme.weebly.com/uploads/1/3/0/7/130775971/96b3ce8c5a98b1e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368219/normal_5fdf0e8d86fdb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369901/normal_60694ebb86eff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448124/normal_60b90ed13deeb.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In 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/67ece88e-58fd-45e5-b1f3-3901a679e9c6/where_can_i_buy_computer_parts_in_qatar.pdfIn PDF document text
    • http://tiduxikuve.pbworks.com/w/file/fetch/144423480/macbeth_act_4_scene_3_stylistic_devices.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a3c8586-b6d5-4950-93cd-453c902d41fa/what_do_you_need_to_study_to_become_a_medical_assistant.pdfIn PDF document text
    • http://niwomif.pbworks.com/f/dadex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be80391b-eee7-4f05-b602-76d4ad4bcb7f/4638217564.pdfIn PDF document text
    • http://funuvutidip.pbworks.com/w/file/fetch/144459267/adjective_and_adverb_clauses_exercises.pdfIn PDF document text
    • http://zizovitunex.pbworks.com/f/888655624.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab96d3a7-d84e-4a9a-a171-a513ed2724dc/53792787732.pdfIn PDF document text
    • http://nukuxim.pbworks.com/w/file/fetch/144509568/exercices_noms_propres_et_noms_communs_cm2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92ed12cf-3469-406f-8972-fa7bc216266b/how_to_add_disney_plus_to_samsung_curved_tv.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_off000112a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A6 1708 bytes
SHA-256: ea3c11c55893d29cadf94120c9934de44505257653f30a2dd30b0e7f7ca97502
font_01_sfnt_off00011b17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B17 5420 bytes
SHA-256: 464372a314af660f35870208a8f9150fc49894abf7058808c6590b59b648c7ee
font_02_sfnt_off00012d72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D72 14040 bytes
SHA-256: 423a9318fcdfbefcffc567aed635f3eaa289d0f69fe079ff40071c24269dcb66
font_03_sfnt_off0001583f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1583F 16096 bytes
SHA-256: 3a87a2a80cb0740ff7ad33dbd9b35031d90241dfccc5ab96a3d2c3133af9c3ca

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