Malicious PDF — malware analysis report

Static analysis result for SHA-256 b211a8b6f097441f…

MALICIOUS

PDF

76.9 KB Created: 2021-03-08 04:55:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: e60d1b2cce840523ae4f8b291761f633 SHA-1: 6fc18d7ad81f0f21d536fc1c17b72e1f9fbae0ec SHA-256: b211a8b6f097441f884ff628e5e80cc84c79698043b9e049f7fd95353ca0097e
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also flagged the document with high confidence. The document body, though heavily obfuscated, appears to contain keywords related to product reviews, suggesting a lure to entice users to click the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 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.
  • 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://yafferge.ru/wb?keyword=samsung%20galaxy%20a10e%2032gb%20reviews In PDF document text
    • https://cdn-cms.f-static.net/uploads/4384030/normal_60372cef2f1e8.pdfIn PDF document text
    • https://cdn.sqhk.co/jisepozidis/kieFsVW/xiwusemimined.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377912/normal_60161899f1812.pdfIn PDF document text
    • https://cdn.sqhk.co/teposodigar/rhgjiy3/vaxubemupexag.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480585/normal_5ffdecd4bdb79.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405662/normal_5ffbc90a4c401.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499635/normal_603e2ca0ec0f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402940/normal_5fd16e5291642.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367007/normal_5febd163a9846.pdfIn PDF document text
    • https://cdn.sqhk.co/gitogozune/cghoWij/mebumekelawiliroluga.pdfIn PDF document text
    • http://waxopuvuru.22web.org/como_hacer_una_carta_de_poder_o_autorizacion.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459483/normal_602f0ce074fc0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454562/normal_600c70ba41a89.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/ad1fde57-2b9c-4728-a1d4-d697a2af6703/lasumebenimote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c470891a-b7fa-4c06-b90c-e62110edc248/suxag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8369a2db-aa2a-42a2-8542-374b979a940d/dozafapaxavejebo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5d43cb9-c8a1-4c45-af58-20bc7a5c674f/how_do_sharks_protect_itself.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b82d277-eb42-40c0-9031-341e0ce22073/vimadetofubujivesiwes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e100c5f-1ec4-48db-9d23-d8ed983907b6/bissell_spot_clean_proheat_pet_vs_little_green_pro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c0fd807-46a4-46c3-b127-ecfb5594e6dc/vojoparusogopurebomeki.pdfIn PDF document text
    • http://vokorugagamozi.rf.gd/92109447082.pdfIn PDF document text
    • http://jenesigafepi.epizy.com/bootstrap_4_modal_form_submit_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebc4c02b-d7b0-41fa-85e5-bca47ec8d17e/carrier_debonair_220_installation_manual.pdfIn PDF document text
    • http://leporib.epizy.com/pifezutosidiratuzusudu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13aa2b0f-c30c-430b-bdbb-a11b644e68b5/writing_tools_roy_peter_clark.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_off0000ded2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED2 5752 bytes
SHA-256: 86d634d4360c8e8ba18696a3b713349a9b113fb22c2a3697d3be7e6d28d347c8
font_01_sfnt_off0000f257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF257 11192 bytes
SHA-256: 272f362321a866b08a0329fcc69e2d2bf77972a9c603a1738f6d9d70b189f022
font_02_sfnt_off000117ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117EC 4324 bytes
SHA-256: ad623bc7c681097dfa1224999cf6cc6072d3ca9a137655dc1129b0261f0b357c