Malicious PDF — malware analysis report

Static analysis result for SHA-256 6167907a0b9fab0c…

MALICIOUS

PDF

80.9 KB Created: 2021-03-26 18:32:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9aa110ec3f5500235e907024c2a3535 SHA-1: 982e3264f32b57bbc454f203cc75c721a5e2ff07 SHA-256: 6167907a0b9fab0c9c5b4cd1da0665b97f8acb2e460de290b1490ee4babb5bc3
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM', suggesting an attempt to manipulate search engine results or direct users to potentially malicious sites. The ClamAV detection and ML classifier also indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous external URLs points to a phishing or content-luring attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/strik?utm_term=how+to+start+onan+5500+generator
    • http://vkrowl.com/modelo_atmico_de_schrodinger_resumen4gal3.pdf
    • http://center-about.com/72341117524trai8.pdf
    • http://natorg.fun/31984923084lkiu.pdf
    • http://yoga-fitness.space/atomic_math_worksheet_answer_keynupgn.pdf
    • http://dress-russia.ru/fleck_7000_master_programmingf8ppy.pdf
    • http://lolkek.xyz/what_is_ethics_in_health_educationg1nu9.pdf
    • http://gonzo-3d.com/amelia_bedelia_chapter_books_levelk6w81.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ae8c1479-5121-4009-b0ed-8259dbb1205b.filesusr.com/ugd/0aff45_2520e441fb5544b1b17ed14eeabe102d.pdf?index=true
    • https://50fe66f1-00be-429c-ab6c-57a9f80d6ab9.filesusr.com/ugd/39cb9d_bea7a426500e4916a18c47ae4357174b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4fbe4efc-32ab-406f-b182-c4e77b4ae6fe/68021128013.pdf
    • https://uploads.strikinglycdn.com/files/b4e6d04e-dc00-4d92-95a6-023b67b53137/20952628849.pdf
    • https://uploads.strikinglycdn.com/files/68562c01-9244-4f72-8795-760a94971478/mutedizalid.pdf
    • https://76df98a8-3e94-4eee-a6f5-23e1de06049b.filesusr.com/ugd/54c74c_0969ae32f975429595d247924704e67b.pdf?index=true
    • https://98771922-91e4-4673-aa0d-7794f4435593.filesusr.com/ugd/b6aaa0_1ce241611b8842be8f1db6e15530f7e8.pdf?index=true
    • https://19e6fc83-c281-4d06-93fd-e8b16a02b90a.filesusr.com/ugd/ce5d00_8bb690b6b8c1494cb12ddd0786e57aae.pdf?index=true
    • https://f7f2eb1f-4ce6-40bf-b337-6bcc2c9c1a95.filesusr.com/ugd/dc6899_a35793c0af58413ebebac8665f18cfac.pdf?index=true
    • https://cae2aa39-5014-47ec-b549-0fed73f36d02.filesusr.com/ugd/c8683e_52473556cd674a098e036ccc212eabcf.pdf?index=true
    • https://uploads.strikinglycdn.com/files/68e90c17-a955-447c-ad2d-40c1cd774f1f/rudijojuva.pdf
    • https://uploads.strikinglycdn.com/files/ba84ea18-8228-4d70-b64b-6218dcdefe96/dell_p2415qb_specs.pdf
    • https://uploads.strikinglycdn.com/files/769cdf0a-cdf2-4130-8803-0ff20caeb79c/falawivejobudotajik.pdf
    • https://5fdaa9e0-ad6d-443b-8779-beb8e45026dc.filesusr.com/ugd/05301a_c389f8c3ddec4cc6b56fbe0b54b2ac58.pdf?index=true
    • https://5663e088-3595-439c-971a-5873693bee35.filesusr.com/ugd/e98895_600f20f7e8e64966aa1d044584b98969.pdf?index=true
    • https://uploads.strikinglycdn.com/files/66311a14-e125-4c44-9f24-481f85808266/pepazanuwoja.pdf
    • https://2dcb0092-dd22-4cef-90c1-8c398f802bb7.filesusr.com/ugd/ff3115_6118100aa3b34e4ab74282ca1636c807.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f42a.bin
550a1df19c8fa147d324831054a04e793b516d97dea3258f27df9866fb43ce15		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF42A 5140 bytes
font_01_sfnt_off000105ba.bin
d2cd98eda3bb301c349f83497b116709750aa4c373c9bd198ee53ee8aab646d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105BA 1936 bytes
font_02_sfnt_off00010efc.bin
3299a4e3911b5c46e296ae1d3e5ba4ab696996e483b7d573880f44221c6ce55f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFC 11480 bytes

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