Malicious PDF — malware analysis report

Static analysis result for SHA-256 711f8bb2624efd19…

MALICIOUS

PDF

75.0 KB Created: 2021-03-29 01:56:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10020f0c1668a6a40ae1a6a0374712d4 SHA-1: f960e311c472dd5ae10ce447fa23a369145b2be0 SHA-256: 711f8bb2624efd1990ae06b76449ac893dee9cae2b9b9e108f8c3b54305ee64c
96 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is part of a link farm, directing users to external URLs. One prominent URL, 'https://baarspo.ru/award?keyword=books+of+the+bible+in+pdf', suggests a lure related to biblical texts. While no scripts were directly extracted, the PDF structure and embedded URIs point towards a phishing or malicious redirection attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9742

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://baarspo.ru/award?keyword=books+of+the+bible+in+pdf
    • http://duwudivusupo.mygamesonline.org/58475560500.pdf
    • http://kufafukedexepix.mygamesonline.org/ap_calculus_review_book.pdf
    • http://mezajozugabaso.getenjoyment.net/enterprise_beginner_teacher_s_book.pdf
    • http://xamojopilupivo.scienceontheweb.net/kidanuganexeguloweva.pdf
    • http://finonit.mypressonline.com/struts_2_documentation.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5d5e1b2b-3e57-411b-98af-26a9eeacd6c3/55235132804.pdf
    • https://uploads.strikinglycdn.com/files/6133114f-d417-4fa9-a695-806fdaef29d6/upgrad_data_science_course_fees_quora.pdf
    • https://uploads.strikinglycdn.com/files/583c8d84-9d7c-4ce6-ae2f-d7ff1ec15726/ac_joint_injury_treatment_exercises.pdf
    • https://s3.amazonaws.com/radubozufiwo/nccn_guidelines_colorectal_cancer_2019.pdf
    • https://45ae50e1-98a8-4501-9ad6-fc0df438eb43.filesusr.com/ugd/b16523_ccdbb123845d470892bfe9b0b685632d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c9f03876-fde9-48a4-bcec-6f318a536417/55213646566.pdf
    • https://409b2d23-5c1d-402e-97df-26c0da9299b0.filesusr.com/ugd/2e3d42_d59e607fa22f4800b035c853c1e98299.pdf?index=true
    • https://uploads.strikinglycdn.com/files/de0519aa-d5d5-47ce-b718-e5f354794953/43818285538.pdf
    • https://s3.amazonaws.com/naxozelozude/56701458906.pdf
    • https://uploads.strikinglycdn.com/files/aeac2209-c854-4b7f-b25a-8e15c2fafb4b/how_to_do_conditional_probability_in_r.pdf
    • https://uploads.strikinglycdn.com/files/98a096be-c8b9-4106-b383-4dcb7a62468f/how_to_turn_shop_vac_into_pump.pdf
    • https://s3.amazonaws.com/foneniz/1487504290.pdf
    • https://29c5b005-6627-40e3-9da1-9f9d3dbc34dc.filesusr.com/ugd/7ad284_83dd6606087147d5bcf2ea5d1ac857d1.pdf?index=true
    • https://s3.amazonaws.com/xilasisefi/free_conjunction_worksheets_for_2nd_grade.pdf
    • https://s3.amazonaws.com/rizijubovapuk/lapirokukojar.pdf
    • https://7c8f45b7-e058-4e27-bccd-8ee7dcb26900.filesusr.com/ugd/d5cf39_f0fba5290b014b76873fd783e7c15657.pdf?index=true
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5df.bin
0bf6a52b464f26f454a77877782b02e13b5be5359548a5d085880f07bc396aab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DF 5076 bytes
font_01_sfnt_off00010725.bin
9e71c3076b297c901a537210b5c21115520a5f34ffe00e8876bb157d34e077b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10725 10888 bytes

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