Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa2f4bf2c5ce7817…

MALICIOUS

PDF

100.0 KB Created: 2021-05-18 14:07:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 8c20d1ce0a8b8cfc8d666ef64dd616e7 SHA-1: 4b43a2ee36013cb0868e41f57fdb925cdc86f454 SHA-256: fa2f4bf2c5ce7817e89a9414692435e632c61ceffd8da13cc04f79bc2917f1d4
254 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is flagged as malicious by multiple heuristics and a machine learning classifier. It contains a link to a known malicious redirector and employs a lure to trick users into executing commands via their clipboard. The embedded content, though heavily obfuscated, suggests an attempt to disguise malicious activity, potentially leading to the download and execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://crophysi.ru/strik?utm_term=jailbreak+auto+rob+script+2020 In PDF document text
    • https://zemaxixose.weebly.com/uploads/1/3/4/6/134636511/jodizikanike.pdfIn PDF document text
    • https://tumupapixukuju.weebly.com/uploads/1/3/4/8/134852222/7697918.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/ed266642-7d6d-4ae1-8fe6-322acd9e6ec4/25484799572.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1857402f-26b2-4576-880b-c4013c664fd4/19202788741.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98941f6d-99db-4ae0-ab11-82869017e7f8/how_to_store_ironman_inversion_table.pdfIn PDF document text
    • https://s3.amazonaws.com/tobovunoberiki/how_to_heat_up_milk_in_the_microwave.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/emergency_response_plan_template_for_business.pdfIn PDF document text
    • https://s3.amazonaws.com/dorobukasawituw/63904409542.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea348f3d-d435-4557-8b7c-5c2387b90091/pojujiwedosil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7ba1b96-8987-4d1e-b411-395a1dc284dd/nipelabarag.pdfIn PDF document text
    • https://s3.amazonaws.com/zatasipezeg/11007512676.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a078343e-33a4-4afc-beae-664ccad53002/cradle_to_cradle_design_def.pdfIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/8711519706.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e54ca8e8-aabd-441c-b305-629df8e06c9b/dell_r710_memory_configuration_16gb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/402ab52e-546b-4a4f-8515-c503e8e480ae/givenuguputupiraloxavi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1356c1e1-9603-4c7a-8059-bdf1b64076da/brother_mfc7860dw_cartridge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f854cef3-24bf-48a2-93f6-63f737dc9741/53900862407.pdfIn PDF document text
    • https://s3.amazonaws.com/xomepixo/48389422885.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_off000142f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142F8 5396 bytes
SHA-256: 1f118e29876d2dbca22def35ef3f11b2596156258271ea6fc03675833c6c5791
font_01_sfnt_off0001555d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1555D 13776 bytes
SHA-256: b7866560b5f81aaa5ab90fd869f5d508ac891d6f2533f1111dd6d058b38dcbae

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