Malicious PDF — malware analysis report

Static analysis result for SHA-256 a05ce8d4c398ab4b…

MALICIOUS

PDF

95.2 KB Created: 2021-05-28 20:58:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 6f84ecaf20ef9923e64868f5b09bc70d SHA-1: d9bb81119f3a9fe9415eb3a1ccb7c1d95c617665 SHA-256: a05ce8d4c398ab4bba022bf6d975452112817977e3ca69b95875bbc6ededd18b
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The primary external URL identified is https://dafemum.ru/strik?utm_term=hiragana+sentence+worksheets+4th+grade, which is likely used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/strik?utm_term=hiragana+sentence+worksheets+4th+grade PDF link annotation
    • https://zifakilis.weebly.com/uploads/1/3/2/3/132302733/8975444.pdfIn PDF document text
    • https://lafasajuju.weebly.com/uploads/1/3/4/0/134017903/3ffcf55.pdfIn PDF document text
    • https://fofijibub.weebly.com/uploads/1/3/3/9/133999799/fosibola.pdfIn PDF document text
    • https://tovozilulu.weebly.com/uploads/1/3/0/8/130873983/c48f0b66.pdfIn PDF document text
    • https://noribazab.weebly.com/uploads/1/3/1/8/131871745/9909077.pdfIn PDF document text
    • https://sozufozixukuba.weebly.com/uploads/1/3/4/7/134730132/gulatokikuwamo_nigabef.pdfIn PDF document text
    • https://zunexoxefa.weebly.com/uploads/1/3/5/3/135340588/4822936.pdfIn PDF document text
    • https://gakulenem.weebly.com/uploads/1/3/1/4/131437742/9f2241ddd247.pdfIn PDF document text
    • https://dirotigakavomak.weebly.com/uploads/1/3/4/2/134235834/9904285.pdfIn PDF document text
    • https://balijijileg.weebly.com/uploads/1/3/4/5/134505585/belifalibir.pdfIn PDF document text
    • https://pejetoli.weebly.com/uploads/1/3/1/4/131454808/6287683.pdfIn PDF document text
    • https://zegasapazenavu.weebly.com/uploads/1/3/5/3/135326880/5ae4a013f898782.pdfIn PDF document text
    • https://defutijobazaso.weebly.com/uploads/1/3/4/5/134587482/gofifiminuniperixegi.pdfIn PDF document text
    • https://kasugokadudibuk.weebly.com/uploads/1/3/4/7/134740653/warotos-larokulu.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/85bca63f-152e-43af-ab7c-7cad55f15e6d/what_can_i_use_if_i_dont_have_brandy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40b01929-c043-49f2-9cff-20bbec08fd28/lista_de_verbos_regulares_en_presente_y_pasado_en_ingles_y_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a70a1a9a-d786-42f6-8ef2-301b2f26982e/alcatel_go_flip_3_reset_network_settings.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aeeca403-8519-4e5b-a9b7-da301ce07e2c/how_to_average_percentages_in_excel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd2ba5f5-eca7-4e6b-8fb0-63ed67b14e40/23315142806.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32937152-a0d5-4672-a5b4-04648142c50e/how_to_install_brackets_on_dishwasher.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85cdbe1d-3518-46e6-9990-8c988dd1c9e5/bless_me_ultima_movie_vs_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20f58fef-fe01-4c1a-9fef-b5a77bf9acc3/8902060795.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7c81de1-abbf-47e6-ac2b-49784f209ce0/best_free_personal_finance_app_ios.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_off0000f3f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F9 21444 bytes
SHA-256: ea87c94c57b9422624b6e4fb7a69de676f427f977ddd16f5a1e784e3f2b70ab5
font_01_sfnt_off000137f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137F3 5376 bytes
SHA-256: b81ca5dda30d6c0a2b2ed3af58b9a8a4007db148e41e18820f3ec15d7c4b5c4c
font_02_sfnt_off00014a49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A49 10908 bytes
SHA-256: b08b53895ddb657b320aeebf752c5d043cfd73bd2e245c026256d385035b1e3b

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