Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd4e6364a48e9cee…

MALICIOUS

PDF

81.3 KB Created: 2021-04-03 03:29:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 9078840cd1824bb36ff9350b6b01a2ea SHA-1: 509201fff9741bacbb7282dd3858ff5b063f3e5e SHA-256: dd4e6364a48e9cee9531290c791188df1b1a8da8e70f68a40c9034fe97ea6940
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a fake browser/software-install lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://botokaw.ru/strik?utm_term=what+is+a+rainbow+runner+fish PDF link annotation
    • http://fasumidivojasuj.iblogger.org/duvikuzorimiwa.pdfIn PDF document text
    • https://fipoxojumudex.weebly.com/uploads/1/3/4/6/134649093/dogak.pdfIn PDF document text
    • https://xevefozivoro.weebly.com/uploads/1/3/5/3/135339272/6824652.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391013/normal_6062b85ba0a50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421639/normal_606257e85ad32.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370090/normal_5fc7b672cbe0b.pdfIn PDF document text
    • https://bijawodit.weebly.com/uploads/1/3/4/8/134883407/2344068.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/e221d62f-0744-49a1-b053-e243661499bb/fimabegovinujedugu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7279a70f-a9a1-453e-bad1-c654dd515dee/83843443825.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07dfd855-7e97-4ff1-97ad-90a4f6b1038b/glencoe_physical_science_textbook_9th_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22174359-d0db-4a0b-9b1d-f3a10d2273a1/what_words_to_use_when_firing_someone.pdfIn PDF document text
    • http://lejipuzab.epizy.com/fallin_all_in_you_piano_sheet.pdfIn PDF document text
    • http://lugirike.epizy.com/mugibukoka.pdfIn PDF document text
    • http://webenawawejoped.rf.gd/picture_comprehension_for_grade_1_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12a8417d-c999-4534-a593-1443e8ce138a/63101688684.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bae171b9-7924-4e91-8ec1-cd8eec8ee3e4/jukate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0534144-e677-43aa-9f39-576d7b221416/macbeth_act_4_scene_2_study_guide_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/229ba5c6-e89b-4316-a6a4-8e0a2797c903/how_to_tie_knots_for_fishing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec466f55-51cf-438d-80a5-a6c4707c3566/how_fast_is_ac1200_wifi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28baa8a2-f450-4225-b0e5-2ce108fc16a0/495441128.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a247d8c-b433-47a4-8de6-15da6ea0ce12/26452547579.pdfIn PDF document text
    • http://joxisuzu.rf.gd/22908994338.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FA 4952 bytes
SHA-256: 1925b7419f3d664a56810ce9fb2d9510faa0c8d5a921d192a2b69e742bb59c03
font_01_sfnt_off000102d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D9 11364 bytes
SHA-256: 7c7f6bbcbc22314dc17c9d2e300284963d5c6d069dbdce049479ab3e78f34b20
font_02_sfnt_off00012973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12973 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f