Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7fedecc85218a9b…

MALICIOUS

PDF

93.5 KB Created: 2021-03-05 21:09:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: c085c40a6e37a07b6e4bfadcbb24e5cd SHA-1: c0ff2c143dd7d08ec6921a5d1c767be67bbd970f SHA-256: e7fedecc85218a9b2d1f5152558f9b0970fe2690a6f23ccc05e9c1aa58a32f0a
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to distribute other malicious documents. The primary URL appears to be a lure for educational materials, likely to trick users into downloading further malicious content. While no scripts were explicitly extracted, the PDF structure and extensive link farm indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://gimoguvi.ru/wb?keyword=edexcel%20a%20level%20biology%20past%20papers%202018 PDF link annotation
    • http://coolmag.biz/witagerokimusirivupivubelwymkb.pdfIn PDF document text
    • https://cdn.sqhk.co/sasimidiweg/yZOjdeT/sujinijowi.pdfIn PDF document text
    • http://detonic-de.website/retim_durumlar_modeliwhayq.pdfIn PDF document text
    • https://cdn.sqhk.co/mevojazix/bijjhjd/48934704904.pdfIn PDF document text
    • https://cdn.sqhk.co/tokebamojos/BKBVhjE/my_city_dre_island_lyrics.pdfIn PDF document text
    • http://digitalcalakk1.xyz/28229811263i4ps.pdfIn PDF document text
    • https://cdn.sqhk.co/dabozijide/ubiiXge/smart_tool_apk_free_download.pdfIn PDF document text
    • http://hugertely.xyz/warojisojevilemepab25h9.pdfIn PDF document text
    • https://cdn.sqhk.co/momujolo/iaGjfsL/do_amazon_prime_now_drivers_see_tip_2020.pdfIn PDF document text
    • http://servempieza.site/basic_excel_skills_test_with_answersvwkgp.pdfIn PDF document text
    • http://ketousa.site/kiboxefasibiwoxizosu04sh4.pdfIn PDF document text
    • http://funseeds.site/9372456269f36sy.pdfIn PDF document text
    • https://cdn.sqhk.co/runenuti/acSIHs2/ice_rage_apk_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/goxobuve/hi5Pghf/51120503076.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/0e5b9135-859e-4afb-ba19-5e0d3d568c12/how_to_add_a_table_to_wix_page.pdfIn PDF document text
    • https://9005a25f-7293-4a73-bb0f-bc58e8c16807.filesusr.com/ugd/e3834b_11deee736a4c48dfbbfce9e029dae37c.pdf?index=trueIn PDF document text
    • https://8f20b4bd-83f7-4a55-8c6f-e9501e2e061c.filesusr.com/ugd/c1c462_f3b0ed8563ab4a6eae6d4f5378fe1818.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/db659d1a-1c9d-460a-a79b-3c5d2403a5ac/kenmore_90_series_dryer_heating_element_part_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/311e4e53-c9cf-4b87-b676-0af462d97e48/72696412762.pdfIn PDF document text
    • https://d497f082-4895-42de-a72c-038d9367c8a3.filesusr.com/ugd/8e727b_0627cbd4cdaf4b2e80d28ee34c64716b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d731831-c5f5-468d-aa25-ddcb94bc5773/niwinugiraduponisofaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eec697ea-3066-4b07-a6d3-a5c8f095567b/what_is_lucida_writing.pdfIn PDF document text
    • https://11ca5eb4-0abe-4d5d-8073-3f36f6088e80.filesusr.com/ugd/8b62d8_8ed7edd0d5ed4e29bd03ee93f213db74.pdf?index=trueIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001389e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1389E 25964 bytes
SHA-256: 1fe94f2c10976dfc58df67e1af214c0b5ed933267ef5407f2b36836b8c859d8b
font_00_sfnt_off0000fe2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2B 6088 bytes
SHA-256: 34b8d6e593ecad7bcd3e5529d2cd9f9d13fc13f335cbd9a2d6838c40c30125ac
font_01_sfnt_off00011300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11300 10988 bytes
SHA-256: 3a8982251577949c22157ea4d2d4ac298dc6dae79d500a53ed5167b551e427e4

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