Malicious PDF — malware analysis report

Static analysis result for SHA-256 34e4d952a18cc489…

MALICIOUS

PDF

74.6 KB Created: 2021-06-02 13:20:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: c37023c9273b5e4dc32f03c59810c718 SHA-1: 0ae97f465a8d028272d3abc3e6bf35f659a07adf SHA-256: 34e4d952a18cc489755b09ef648adeae58de0b0c0f52e9e678279705fef62e80
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs, with one prominent URL pointing to 'smidgel.ru'. The presence of a link farm suggests an attempt to distribute malicious content or redirect users to phishing sites, aligning with the Spearphishing Attachment technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 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://smidgel.ru/pbw?utm_term=colors+of+the+wind+flute+sheet+music+pdf PDF link annotation
    • https://tutuludoj.weebly.com/uploads/1/3/0/8/130874598/tamakuzesore.pdfIn PDF document text
    • https://wutowenejeboz.weebly.com/uploads/1/3/4/5/134599911/6658905.pdfIn PDF document text
    • https://kipuxemoxux.weebly.com/uploads/1/3/4/6/134616309/beduditorezum.pdfIn PDF document text
    • https://bokorakalawu.weebly.com/uploads/1/3/4/6/134643693/danonomiwoku_xobavaxapi_tepeguru.pdfIn PDF document text
    • https://bumewotosebixab.weebly.com/uploads/1/3/5/2/135298585/tagamoliw.pdfIn PDF document text
    • https://tobevasisutigi.weebly.com/uploads/1/3/0/8/130814636/53d953d33cb.pdfIn PDF document text
    • https://sozugubew.weebly.com/uploads/1/3/4/8/134893137/nunuvizinimag.pdfIn PDF document text
    • https://gerudupox.weebly.com/uploads/1/3/2/7/132712596/xidafunetafowobapuxi.pdfIn PDF document text
    • https://raxasowofano.weebly.com/uploads/1/3/2/6/132681821/8f3404651b3023.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/9c99d58b-fac8-4bdc-ad44-50610bb53745/16606552357.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24c74a9d-7a41-4a3c-8cbc-23f6cb6135cf/9115882676.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c2536f2-73e7-4685-b1ef-d76de482bc6b/pokevoledufelomixokitom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a33b32f5-07bc-45f2-977f-21ea0accb8a4/51768213764.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ea4a178-cffc-4f71-bb4e-3bd614386ecb/74534121665.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/393d7b95-e30d-4cfc-baf8-2bac3a5e4480/all_white_air_force_1_mens_size_11.pdfIn PDF document text
    • http://xalomuzavege.pbworks.com/f/how_to_set_irrigation_timer.pdfIn PDF document text
    • http://viluxese.pbworks.com/f/the_zombie_chasers_story_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7279c7b1-01fc-4cbf-847a-5fb2d444b1fd/python_programming_for_absolute_beginners_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/808cce00-ca4f-49a5-810f-d91cd54ce741/pnas_editorial_board_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d4d5953-c9ef-48e3-8ba8-c11c398ab209/sakerudazuzogubojetedat.pdfIn PDF document text
    • http://sepaxebi.pbworks.com/w/file/fetch/144414003/illustrator_2020_system_requirements.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f44b7157-cab2-4a9b-921d-4e0eca7a7eed/35985081563.pdfIn PDF document text
    • http://vifogajo.pbworks.com/w/file/fetch/144483477/analytical_methods_of_determining_bearing_capacity_of_soil.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_off0000e5ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CE 5180 bytes
SHA-256: 5ee2e22f19f17fe78cec6e7b2e3747c5bb4c82d3043cb34f8416417b51fbd79d
font_01_sfnt_off0000f756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF756 10968 bytes
SHA-256: 5779ee10b0f29f0ec2974e70781a6fc7e733fd43b3b06ef233b13f175b4cfdf2

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