Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6126648c63c9b6a…

MALICIOUS

PDF

81.3 KB Created: 2021-05-16 17:35:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 302c2ead50aad70d30927188db325049 SHA-1: 0a86b592c89242af403c3d2627b221da292edeee SHA-256: c6126648c63c9b6ac7aecaf1fa726bb4e87fe6afbe30c3de1698f03038e5836e
66 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 strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains text related to 'Health psychology' and 'biopsychosocial interactions', suggesting a lure to disguise the malicious intent of directing users to external, potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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://ponafet.ru/strik?utm_term=health+psychology+biopsychosocial+interactions+ninth+edition+biopsychosocial+interactions PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4405206/normal_6019177673245.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458826/normal_6046e7a59887d.pdfIn PDF document text
    • http://lobuzef.iblogger.org/91622954231.pdfIn PDF document text
    • https://cdn.sqhk.co/sofetarunox/OhciexR/medicare_consolidated_billing_guidelines.pdfIn PDF document text
    • http://todayshop.website/1122821144u2a27.pdfIn PDF document text
    • https://cdn.sqhk.co/vefutifeves/3L8gjaG/regal_cinemas_near_me_open_now.pdfIn PDF document text
    • https://cdn.sqhk.co/tefupudoma/i9hsjan/cartoon_wars_gunner_ios.pdfIn PDF document text
    • http://contarinihome.com/dometic_single_zone_thermostat_manualmd94k.pdfIn PDF document text
    • https://cdn.sqhk.co/nokulebepoba/hcIsgeX/slimefest_2020_inglewood_ca.pdfIn PDF document text
    • http://zebinoleruf.iblogger.org/litufuniwojapib.pdfIn PDF document text
    • https://cdn.sqhk.co/xokebuzizo/gojbia2/29915322046.pdfIn PDF document text
    • http://www19216801.site/106015160497nlfc.pdfIn PDF document text
    • http://rgtuitp.ru/expository_graphic_organizer_5th_gradedrvoz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sirerig.epizy.com/62764906938.pdfIn PDF document text
    • https://6632aaff-1fe9-4f1d-acb3-7d444e457837.filesusr.com/ugd/ce4b7c_f5dc4f4285bf4ff48092089d1b587114.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fd473e5-fa20-415c-87e8-16bbbf9a69b4/casio_hr-100tm_ink_cartridge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9de67c4-d7fe-4708-bdcf-04fb10bc4281/neato_robotics_xv-21_battery_issue_0002.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6864c478-c6d1-4fc5-bb88-32baddcd6264/how_to_replace_a_dryer_gas_line.pdfIn PDF document text
    • http://fimejeza.epizy.com/pathology_practical_book_download.pdfIn PDF document text
    • https://d6d3a1c5-32ce-46e9-ae92-c5b8d84d65d9.filesusr.com/ugd/a3b54b_8e2b7a15705d40e9b57255e7f39a9ce2.pdf?index=trueIn PDF document text
    • https://8d59741e-369e-44be-b01e-8fbcb09d2d01.filesusr.com/ugd/7cefa9_aa0867ab5767415f91f2f375d65a2a85.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF98 5536 bytes
SHA-256: a8f29e8af5fc8934a60433ec24bf44c7ef2fdf24a05c4216ffb32e68d809a674
font_01_sfnt_off0001125f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1125F 10780 bytes
SHA-256: 59ecab9b355d04441fc1b8c5152e1e6db40bb67d5fe2c7b1368e6e8fc511c305

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