Malicious PDF — malware analysis report

Static analysis result for SHA-256 b50352c5bb2124f3…

MALICIOUS

PDF

88.0 KB Created: 2021-03-23 09:44:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a45d8791d3ae0e15a68f85c3571f68bf SHA-1: d322d8604325c676b91d865b954d9972d67dd768 SHA-256: b50352c5bb2124f3575cb467d735f0269f7323850b708b3e274ba1f95771077b
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a lure related to making money via currency exchange, and a heuristic indicates it's a payment redirection lure. It also contains a mass external PDF link farm, suggesting it's part of a SEO spam campaign. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs indicates potential redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise 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://pelibifir.ru/strik?utm_term=how+to+make+money+using+currency+exchange
    • https://cdn-cms.f-static.net/uploads/4453741/normal_602c426692515.pdf
    • https://cdn-cms.f-static.net/uploads/4417670/normal_604e72b2afd95.pdf
    • https://badetujunomut.weebly.com/uploads/1/3/1/8/131857650/3161484.pdf
    • https://cdn-cms.f-static.net/uploads/4388407/normal_5fd64f90ad9a6.pdf
    • https://mofazutozu.weebly.com/uploads/1/3/4/8/134871383/ritexerofifav.pdf
    • https://netebina.weebly.com/uploads/1/3/4/5/134596662/neziwugisukavi-zogixedetizon.pdf
    • https://cdn-cms.f-static.net/uploads/4366660/normal_602e3a43d65e5.pdf
    • https://kesaroxet.weebly.com/uploads/1/3/0/7/130775747/9327862.pdf
    • https://tumenunomowet.weebly.com/uploads/1/3/0/7/130775025/diwajidipo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4c86c71e-1986-4849-8778-5881a79bfac5/1549649530.pdf
    • https://0b609444-e5a2-4a7e-9779-a3c6bae51a53.filesusr.com/ugd/529dbf_350925b8624d420596c8110032186c97.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7e6341ad-53f2-404d-ae69-c1c8215d1064/ibn_kathir_the_beginning_and_the_end.pdf
    • https://9334512a-4df1-45dc-8804-f0fa1d9e2a3d.filesusr.com/ugd/9466eb_1e1f6f1f787d43a28221ae865fa7aec9.pdf?index=true
    • https://0a497e50-07dd-462d-832d-d8678f741a8e.filesusr.com/ugd/5f857b_e2628710f79d4db28e3f2eaf4aa99e47.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0884acee-f9f5-4a9b-8827-19d428f84e28/technical_writing_certification_coursera.pdf
    • https://uploads.strikinglycdn.com/files/6d92eca4-c6ce-4bbf-8d48-f50861393a5c/wilaseresopeg.pdf
    • https://uploads.strikinglycdn.com/files/4bd31359-e52e-474c-8c38-19d167d81f1a/63854593669.pdf
    • https://uploads.strikinglycdn.com/files/697e37b4-2c62-4018-a011-78f9cefd4f68/77496142650.pdf
    • https://63c5840e-267c-49ed-94d3-fc9f9d8b9c0b.filesusr.com/ugd/8c5bc8_73c2fc5991c24013a58af67ac4fcd894.pdf?index=true
    • https://uploads.strikinglycdn.com/files/373e6e65-76ef-4d31-a6fb-9e3307b05c49/56394164244.pdf
    • https://dd3528e8-ded0-4753-843e-0d3cb9f542e7.filesusr.com/ugd/4d6844_38d94c30ffd34f8dac5dc1d3049ae0dd.pdf?index=true
    • https://afa032df-bfad-47da-a9c8-c79260182993.filesusr.com/ugd/6f9b04_34e60357bc2e445ea9056443484da0df.pdf?index=true
    • https://a815f367-2516-4b88-9496-eed07d5c1eb7.filesusr.com/ugd/665c20_987834bef7054afe9685792ac565d9c0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8ffec1d9-fb6f-492c-b3c2-7e7d764434ad/easy_piano_music_for_free.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_off00011847.bin
74969c132aae800cb928e2f33a10c42cebdd78707245e3ab7a1311f78d548e44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11847 5468 bytes
font_01_sfnt_off00012ad1.bin
990c318ba8ee9bb01741d8e982d1566e2f6b1669eefdf0a27a1bebc58a993ec5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD1 11100 bytes

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