Malicious PDF — malware analysis report

Static analysis result for SHA-256 aca8141cafc8e49c…

MALICIOUS

PDF

79.2 KB Created: 2021-03-14 12:06:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 2d9a5a23afec09a7867b257109355448 SHA-1: 0cfa29db297507362f316afe75ba139b499fd15c SHA-256: aca8141cafc8e49cbd45b83789aa00f8a986452ce2ec6ee75a80043676047a19
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high-confidence ML classifier and ClamAV detection indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host many links on disposable domains, likely to obscure malicious destinations or engage in SEO abuse for phishing. The primary malicious URL identified is https://botokaw.ru/wix?keyword=batchelor+middle+school+volleyball.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 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/wix?keyword=batchelor+middle+school+volleyball PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465930/normal_603bef2274852.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455406/normal_5ff6100ca5ea8.pdfIn PDF document text
    • http://zukesijinizik.mywebcommunity.org/keretigid.pdfIn PDF document text
    • http://ferafukapawap.scienceontheweb.net/vc_generator_2k16_no_survey_no_human_verification.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453334/normal_6000f3973f649.pdfIn PDF document text
    • http://leporabev.mywebcommunity.org/special_theory_of_relativity_simple_meaning.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425514/normal_5fec3cf43e3fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406514/normal_603e8f9a8ddcb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462038/normal_601ab32b757bd.pdfIn PDF document text
    • http://mugurapit.sportsontheweb.net/vakisodomobutevuziw.pdfIn PDF document text
    • http://wivaserana.mywebcommunity.org/positive_thinking_techniques.pdfIn PDF document text
    • http://wulutano.mywebcommunity.org/why_isnt_my_washer_spinning_and_draining.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/c680d7c6-92bb-4036-b6fb-2cfbcb8db980/four_past_midnight_book_review.pdfIn PDF document text
    • https://s3.amazonaws.com/fekazudabo/nupegumadevuxevodeluva.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/futotenivafakuzi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/874fcb0f-d7c3-4b00-b57b-bd996b623b52/how_to_run_a_market_stall.pdfIn PDF document text
    • http://newepizudef.atwebpages.com/23792702464.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d4f48c3-aba0-4f3b-ae64-509105b1d549/how_to_set_up_levoit_air_purifier.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/112f0e0a-da64-494f-bfff-53fc0e33c0db/zexuxirevadamiriza.pdfIn PDF document text
    • http://mugomodag.atwebpages.com/41838570657.pdfIn PDF document text
    • https://s3.amazonaws.com/lazesej/14064669586.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b35e541-b5b6-4b2d-964d-e4fdec20c363/what_expense_accounts_do_you_close.pdfIn PDF document text
    • https://s3.amazonaws.com/pirosisob/sasuzikowenof.pdfIn PDF document text
    • https://s3.amazonaws.com/mokixetat/57360376722.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_off0000eaf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF0 5212 bytes
SHA-256: 1ffd55b76d938f8aaa51707ccf3809f36df673f3df10377c63f3fe04da9661e2
font_01_sfnt_off0000fcac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAC 10540 bytes
SHA-256: 34c5ca998a20e449f0ce7ec251d7464d2dece0ed963f18d800f2d87af6e944c8
font_02_sfnt_off000120b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B8 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230