Malicious PDF — malware analysis report

Static analysis result for SHA-256 39c15167484fb2a9…

MALICIOUS

PDF

87.0 KB Created: 2021-06-01 13:55:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 46f3930d27ea55e4bc6b47ca6e37c751 SHA-1: b1e5811fa466a410785dab7fe011e506adb33172 SHA-256: 39c15167484fb2a914b72b25ad15c70acf13a7d319bd8d87f245b80dc724b694
186 Risk Score

Malware Insights

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

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, directing users to numerous external URLs, many of which are hosted on disposable domains. The document body, though heavily obfuscated, contains a question related to Boy Scout uniforms, likely a lure to encourage clicks on the embedded links. No scripts were extracted, but the PDF structure and external links suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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
  • 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://pistant.ru/pbw?utm_term=where+do+you+put+the+totin%2527+chip+on+a+boy+scout+uniform PDF link annotation
    • https://static.s123-cdn-static-d.com/uploads/4454665/normal_60b5d0fa018f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401545/normal_60249d476cc0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415518/normal_601754846b2ff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383807/normal_5ffda96152522.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403823/normal_60060f59e8e09.pdfIn PDF document text
    • https://gedenotovet.weebly.com/uploads/1/3/1/3/131379555/vajofozisodipovirer.pdfIn PDF document text
    • https://kutozeworefo.weebly.com/uploads/1/3/4/3/134306688/xisogipegebefuxuloxi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373797/normal_604632cbed58b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452392/normal_606e1d164ce4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423454/normal_6050c9d1810e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444370/normal_605a64e271a6e.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
    • http://ziludezubeju.pbworks.com/f/how_to_use_emeril_lagasse_pressure_air_fryer_plus_6_quart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61d15f89-61bd-4e45-9bad-c98638b3a57d/31234221023.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8789125f-bafe-47f2-b965-05500eca7126/chapter_21_review_nuclear_chemistry_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdefbbe7-9662-4886-b6a0-43fe73620c12/edison_nj_teacher_salary_guide_2019.pdfIn PDF document text
    • http://pamotekegopa.pbworks.com/f/how_to_find_deleted_call_history_on_iphone_6.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d04cba6-17ec-4f2c-8f34-5d4152ad2094/apollo_twin_usb_c.pdfIn PDF document text
    • http://vatojorisa.pbworks.com/w/file/fetch/144435609/nelavivejubufegatisab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41949666-69c9-49fd-bb41-d89a896b8e08/acordes_de_jazz_piano.pdfIn PDF document text
    • http://viluxese.pbworks.com/w/file/fetch/144428409/xasurinusimasamazubaj.pdfIn PDF document text
    • http://jesababa.pbworks.com/w/file/fetch/144424632/hoi4_uk_multiplayer_guide.pdfIn PDF document text
    • http://niwomif.pbworks.com/f/crown_victoria_manual_swap.pdfIn PDF document text
    • http://xiwitanul.pbworks.com/f/rewrite_the_following_sentences_into_negative_and_interrogative_form.pdfIn PDF document text
    • http://lakebimutep.pbworks.com/f/the_five_love_languages_singles_edition.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_off0001070b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070B 5532 bytes
SHA-256: 5e14f2a0b409c0c9fe5f6b9049b69d5a17ba9adf7d0291cf3ab5afc6375f4d5d
font_01_sfnt_off000119bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119BD 11356 bytes
SHA-256: 0106a4e4a528f124bc6208b5310597bcd522d38cc75e96bef527a412c393a7b9
font_02_sfnt_off00013ff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FF3 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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