Malicious PDF — malware analysis report

Static analysis result for SHA-256 78506c8fc91f2583…

MALICIOUS

PDF

78.2 KB Created: 2021-03-21 21:46:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c3fe67c2a97435a8dafdebb88621b8ca SHA-1: 962f8c4dce8fdaef62a254a1ba04a41c7e28ad30 SHA-256: 78506c8fc91f2583c996c25aad8261518dab26b83ab6d1d2d4b9147a4816e871
96 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a 'PDF_SEO_LINK_FARM', indicating a large number of external links, with the primary suspicious URL being http://universityru.fun/13182858426kebqq.pdf. The document body, though heavily obfuscated, contains text related to 'cec 2020 call for proposals', suggesting a lure. The presence of embedded URLs and the ML classifier's high confidence score further support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 4

  • 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.
  • 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://druttle.ru/wix?keyword=cec+2020+call+for+proposals
    • http://universityru.fun/13182858426kebqq.pdf
    • https://static.s123-cdn-static.com/uploads/4447278/normal_5feaf9381f606.pdf
    • https://sivirezu.weebly.com/uploads/1/3/4/4/134445297/benemuzalimewom.pdf
    • https://static.s123-cdn-static.com/uploads/4389571/normal_5ffdd5f97feee.pdf
    • https://static.s123-cdn-static.com/uploads/4391340/normal_60055feb6fe17.pdf
    • https://cdn-cms.f-static.net/uploads/4443803/normal_601cf9931259b.pdf
    • http://bestunew.xyz/55261673035opwhe.pdf
    • https://kivogumit.weebly.com/uploads/1/3/1/0/131070776/9970088.pdf
    • https://vabeluzaxudi.weebly.com/uploads/1/3/4/8/134884936/4679211ba9e1d.pdf
    • https://daxekofaji.weebly.com/uploads/1/3/1/6/131606395/1f3b9cbecb3e959.pdf
    • https://noregodexu.weebly.com/uploads/1/3/1/8/131871467/3853d8345524ca.pdf
    • http://teachost.com/hyperlink_to_sheet_in_excel_from_wordnr07h.pdf
    • https://static.s123-cdn-static.com/uploads/4474978/normal_5fdf4c1b676c2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wutogugej/gdp_national_income_formula.pdf
    • https://s3.amazonaws.com/nilafafakem/tajevupewosiwutuw.pdf
    • https://s3.amazonaws.com/mesotodimus/wuwevoliroxozotewo.pdf
    • https://s3.amazonaws.com/midaguvimabof/guidewire_stock_ticker.pdf
    • https://s3.amazonaws.com/tamobalasu/la_guerra_de_las_100_horas_honduras_y_el_salvador.pdf
    • https://uploads.strikinglycdn.com/files/e7d6c823-79ae-4c99-bb90-92b72840f32b/dungeons_and_dragons_online_classes.pdf
    • https://s3.amazonaws.com/nodetuxapabara/handclap_violin_sheet_music.pdf
    • https://s3.amazonaws.com/zafaronivaj/26251555184.pdf
    • https://s3.amazonaws.com/dakebesuvum/jaani_dushman_2002_full_movie_3gp.pdf
    • https://uploads.strikinglycdn.com/files/ab72a4ba-c203-49da-a6e3-31633d90df6b/english_speaking_grammar_book.pdf
    • https://uploads.strikinglycdn.com/files/01dd9509-2b4d-44db-a47c-1a8eef98b051/balajogomufo.pdf
    • https://s3.amazonaws.com/zowibatev/webat.pdf
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f351.bin
376efcd813b560327590709b7d8000c466fd06b86bbb457be18e1c4fa692e964		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF351 5188 bytes
font_01_sfnt_off00010506.bin
52e086a60666bdff4617a0e223217c4a954d216adb234f6171bd496fc924fc06		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10506 11328 bytes

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