Malicious PDF — malware analysis report

Static analysis result for SHA-256 231821834b4ff92b…

MALICIOUS

PDF

77.9 KB Created: 2021-03-28 23:02:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: e2535955c7cab9193c8177402290cf47 SHA-1: 258a0442e2f28f4dc2da09ce54dca60284cd46ba SHA-256: 231821834b4ff92b61d30b27b93d50b415f2adc341ef6a000b89f1816bca580c
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL pointing to a domain associated with search engine optimization (SEO) link farming. This suggests the document is designed to drive traffic to other sites, potentially for malicious purposes. The ClamAV detection and ML classifier further indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • 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://baarspo.ru/wix?keyword=puppies+for+dummies+pdf+download PDF link annotation
    • https://cdn.sqhk.co/bureruverog/hiAjbji/41372621987.pdfIn PDF document text
    • https://cdn.sqhk.co/zekuxemelop/dfjcNia/59366686299.pdfIn PDF document text
    • https://cdn.sqhk.co/surodamiz/gdzzQgg/dial_911_simulator_game.pdfIn PDF document text
    • https://cdn.sqhk.co/mewivupa/cijjgkU/soccer_3d_subbuteo.pdfIn PDF document text
    • https://cdn.sqhk.co/gutinisiv/h085uJi/thimbleweed_park_delores.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://083189c9-8220-4687-a375-57be19a37228.filesusr.com/ugd/909b15_d90f7a4922f445fcb1a1ced5f16ad6fb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xepululejiwof/72377117599.pdfIn PDF document text
    • https://s3.amazonaws.com/jevedijadiki/90689763808.pdfIn PDF document text
    • https://2a4c341d-9af7-4f89-b48a-1b926ad6ced7.filesusr.com/ugd/dd6616_4739710d55b74aacb41f7a427fc723b2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c5ab9ca-218c-4523-970e-a7088063fe1f/algebra_with_pizzazz_did_you_hear_about_page_31_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/581a5633-c7d6-4a61-be5c-adcfa3902db3/how_to_use_ds4windows.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8c7857a-cbca-48b8-86ce-83382c616fd2/84639963660.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57e2d683-431d-4b82-90fe-a429e1dfaa8c/kobalt_10_inch_miter_saw_parts.pdfIn PDF document text
    • https://ed36ca5d-e6e9-4caf-8bbb-3a8af5cfee16.filesusr.com/ugd/971556_1c04e4d9d2ad4a8688ca35ba57628497.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sivanira/smart_board_siding_for_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/inference_worksheets_9.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/864ed390-a017-4f65-8729-7f702eccd717/4216232310.pdfIn PDF document text
    • https://973697ad-ffa4-4f9d-85cd-0c9d1ea039ee.filesusr.com/ugd/5f5755_a956955863644d7788227c0ab4b27e1d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nitizobuv/standard_guide_for_fretting_fatigue_testing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53ad9400-dd45-49d2-a2d0-19b8032de297/domokepuzezowiwogunikuro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67b8bcfd-6a60-4a31-a730-8459e8ccded0/47475554105.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/087c42b1-5553-4c83-a9cf-6674c56061bb/49402639491.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fba4eb5-2921-44b1-81b3-e2bb43662464/what_products_are_made_in_america.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_off0000f19f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19F 5280 bytes
SHA-256: 491fb8ca801689a74d8915c0ec856c18522f0d9201baad9d2d2ce27f3809185b
font_01_sfnt_off0001038e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038E 11336 bytes
SHA-256: 345882b86d320e90cbaddf5d9f6a8da3705463738c8e2601433fbc6cb7d293ed

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