Malicious PDF — malware analysis report

Static analysis result for SHA-256 f16e41dae9bcb1fd…

MALICIOUS

PDF

111.8 KB Created: 2021-03-05 18:58:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6645e0e5c7b23e50d14b7570e944d4d8 SHA-1: 838964a12a469640b4c464ab924e77559c95cd2d SHA-256: f16e41dae9bcb1fd155a52b7d7819b1c4404fdc62cbb88534bd9d89c81904f05
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or redirection scheme. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attempt to direct users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/aws?utm_term=will+wii+rock+band+instruments+work+on+ps4 PDF link annotation
    • http://jinaxewujabiwez.22web.org/rekitobeba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377125/normal_5fda56ef91117.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403960/normal_603803cba69a8.pdfIn PDF document text
    • https://balevowoperat.weebly.com/uploads/1/3/1/3/131397989/8773070.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470981/normal_5ffa02bde7930.pdfIn PDF document text
    • https://lolujimibo.weebly.com/uploads/1/3/0/7/130740441/radetirol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471971/normal_6030df2b4c532.pdfIn PDF document text
    • https://tajujarosoko.weebly.com/uploads/1/3/4/7/134749081/bagefe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483089/normal_603b9ebf0203e.pdfIn 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/62be8250-4b70-4b17-bc83-426a9d16b906/the_expanse_season_5_release_time.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b78c21bb-ab6e-4e5b-b8c8-835915276623/kapilirugixobiradib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a91794e9-47c6-405c-8c2b-33d2f374b77f/how_to_empty_capsule_container_nespresso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/268dca5d-f8b2-4bbc-a29b-d79ce75f903f/zixopegijepajidowigosojog.pdfIn PDF document text
    • http://suboxasolu.rf.gd/atom_javascript_editor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a9873d6-6b42-4be6-be28-90d873be4be0/17325800222.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4ea1a3f-6f13-4f2a-ab0e-b148aeab1ae2/how_to_heal_your_gut_feeling.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2efae456-2725-484a-ac2e-af1cd5e9abb8/valexewe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/050342ee-c056-4c77-b961-b3491517f966/53416892614.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f70a155-6a19-45ed-acb2-a9adc8d6a7e5/bissell_proheat_2x_advanced_how_to_use.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b43d0874-6225-4573-88f6-63aeeab91c0f/shell_script_example_run_command_and_get_output.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b1e3480-0968-44ee-9cf7-641c5704d2a9/hi_point_model_c9_9mm_luger_ammo.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000178bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178BB 5616 bytes
SHA-256: 6aac6d7be05241c8581617deb0ad1461d60a58fb35d21317e54a2e041b944943
font_01_sfnt_off00018bd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18BD7 11148 bytes
SHA-256: ce0364bff53ef74e113d200987d2c5d4f50da6b697e86f0e2916550be723c275