Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a8b37bed340afb9…

MALICIOUS

PDF

75.5 KB Created: 2021-03-27 11:50:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 90f4c8d987f492758dd97612a334437e SHA-1: d17fdc1e6802a84d482a72fa24973b1dc63a8954 SHA-256: 6a8b37bed340afb9fb758341dc7c260224c77c387c7d9cf81d31ef3fe447fc4c
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, many pointing to disposable hosting, and one specific URL is flagged as a potential phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jumiwimov.ru/123?utm_term=report+drug+abuse+anonymously PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c6af5eb-a289-49c6-b4f8-840b05a4a77c/the_monkey_king_3_cast.pdfIn PDF document text
    • https://6f12065f-c45d-410c-b048-6ec23fb2b810.filesusr.com/ugd/02ccf7_04ed927037234359be25ef2ad8b8436c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/744d7f30-cb84-475d-9494-e7d9bae633a7/electric_circuits_analysis_by_nilsson__riedel_10th_edition_pearson.pdfIn PDF document text
    • https://48e4e0df-78ce-4736-8797-27735e68dc67.filesusr.com/ugd/f3b179_f6e3616f915a43d8b4d06c68c3d8659e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b3e068b-6872-418a-ac7f-010cd3ae756e/94722177620.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/589266b4-aa5e-4a11-9d32-51a638e65431/panda_express_orange_chicken_menu.pdfIn PDF document text
    • https://2e4b0ed6-c237-476e-b23b-7c95f147629f.filesusr.com/ugd/30e930_a344a2ea5a2b420eb43c028215556824.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/what_is_power_about_politics.pdfIn PDF document text
    • https://s3.amazonaws.com/xakajoziwibi/serum_creatinine_test_report.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/robbery_bob_hack_apk_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fd68077-cbba-4e05-95fd-25f5c5a04632/how_to_make_a_guy_commit_to_an_exclusive_relationship.pdfIn PDF document text
    • https://5b5cf7c4-d983-4e27-bd54-44d52fc9074e.filesusr.com/ugd/2f9450_835a997ac78a4f42bf577da00d1ae02a.pdf?index=trueIn PDF document text
    • https://356bbf58-84af-4bff-99a9-d03346e46411.filesusr.com/ugd/b5472a_4ad1d13ce95540f29c105eb0bf73ab40.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e244b69c-7b80-4573-be16-c94aa1e8246c/speed_queen_front_loader_error_codes.pdfIn PDF document text
    • https://00407fa8-a9ef-4b78-9bbe-46147fc8acf6.filesusr.com/ugd/5ecadc_3ba29c89e065425a94ea8d34c27fcc7c.pdf?index=trueIn PDF document text
    • https://246406bc-bb0d-4f29-baed-d8a6153a9543.filesusr.com/ugd/3ddeef_0040aec85e5748f79451b4bf297def08.pdf?index=trueIn PDF document text
    • https://6131fb9f-3080-406c-a6ab-c4686b6a2f6f.filesusr.com/ugd/52be6f_a1cf89916f7c4d1aa5ddabfef73cc797.pdf?index=trueIn PDF document text
    • https://288dffde-0386-48bd-adba-b069b5f3b70f.filesusr.com/ugd/7e1b39_151e25955dea44e0b67d1552a083a406.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fejakixoweka/sheet_music_bryan_adams_everything_i_do.pdfIn PDF document text
    • https://s3.amazonaws.com/farefasejikap/zejajafag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7353a440-299f-4b1c-974a-8379624806c5/ribuzobox.pdfIn PDF document text
    • https://s3.amazonaws.com/vovopafubipu/how_to_print_from_iphone_to_hp_deskjet_3752.pdfIn PDF document text
    • https://s3.amazonaws.com/nilafafakem/esic._nic._in_pharmacist_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/egomaniac_vi_keeland_free.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_off0000ea73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA73 5528 bytes
SHA-256: cc8a473469d58f63798d2acb2b53fbd275e57cfb5c690bfd141eb0f3d2a3cc3e
font_01_sfnt_off0000fd2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2F 10416 bytes
SHA-256: b8836775bb4a1c38c90c9344690c6e8bf8cde3298b11af5d1960b711c9b609b5