Malicious PDF — malware analysis report

Static analysis result for SHA-256 c07f4b75cbb2e74d…

MALICIOUS

PDF

78.7 KB Created: 2021-03-26 07:26:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 906d32ebbacbcdd11105063644ca5da2 SHA-1: 9566c5fce76bd60836bf5a41f3532afbb6e37c3f SHA-256: c07f4b75cbb2e74d85899cade23a50299b6a57045d586697569ab57cc2f1c43e
66 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 4

  • 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://xajibur.ru/123?utm_term=cementite+formation+cast+iron PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4472213/normal_60177c568544c.pdfIn PDF document text
    • http://sizegoduxuxa.mygamesonline.org/jaboxubokokunagenen.pdfIn PDF document text
    • http://soinjaga.ru/descale_keurig_2.0_using_vinegarnczjn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460477/normal_6040c1e2e400b.pdfIn PDF document text
    • http://bopolubolef.mywebcommunity.org/barrons_gre_22nd_edition.pdfIn PDF document text
    • http://wijasagasipode.getenjoyment.net/c_programming_break_out_of_nested_loop.pdfIn PDF document text
    • http://neditaxuvim.getenjoyment.net/what_is_a_group_in_organizational_behavior.pdfIn PDF document text
    • http://mikrotikwizard.com/how_do_i_use_m_audio_fast_track_in_garagebandiz6bw.pdfIn PDF document text
    • http://crawlmqyu.space/1455013235njnwu.pdfIn PDF document text
    • http://lifeshop.pro/61351296709xszh0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://73856814-13bb-4d44-aeaf-752cce6ba6bd.filesusr.com/ugd/a0d21a_5180e20a88fd42ddb2a91fbda21b74f8.pdf?index=trueIn PDF document text
    • https://6f4861c6-cdf0-4a5f-ba2d-f9c5e5bfbee6.filesusr.com/ugd/77941b_1c23a30f4a6244ddac8d793c50da72da.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f18e96c9-e76d-4346-bac0-269d00f2a1cd/thetford_rv_toilet_parts_31683.pdfIn PDF document text
    • http://wuragumok.atwebpages.com/how_to_open_a_dsc_impassa_panel.pdfIn PDF document text
    • https://170a7d3c-74f0-42f5-9ead-98ae292a4922.filesusr.com/ugd/a18aa6_75263e9e4e6d424886507466f8e1b987.pdf?index=trueIn PDF document text
    • http://piwakitidi.onlinewebshop.net/minimalismo_libros.pdfIn PDF document text
    • https://676a7a22-5bec-432e-92e0-9d4a0a27851c.filesusr.com/ugd/a1fb72_aeec4fd131584b14afb62c2101306c73.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d588869a-688b-45d1-9c7b-1a6e174c450f/68541508494.pdfIn PDF document text
    • http://kuxemozoxabonag.onlinewebshop.net/969378594.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f4c1f13-261d-4bc5-bfe0-e2f9e2ed3378/is_skim_milk_allowed_on_21_day_fix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df69b876-33c4-41a6-b7b1-e5ca6eec8359/xajizamoruguvodusuwizome.pdfIn PDF document text
    • https://7ef5d8b8-74ac-4e0a-b0a0-fa61ca6462a8.filesusr.com/ugd/23e9be_d7108ad9c95340dd8bd1821660fc4059.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3ecaa48-7504-4031-981f-88841261ee64/the_odyssey_worksheet_part_2_answer_key.pdfIn PDF document text
    • http://gomugugagaf.onlinewebshop.net/addendum_contract.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C1 4900 bytes
SHA-256: e3dc05d5d5e08a513bcd772722226627db064e80b738771118affb97d389f40e
font_01_sfnt_off0001064d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064D 10932 bytes
SHA-256: 5e2bb19b4f4e731524cf478209e3c7592a3bf4abed26c7d8c1fdd0abbd9561a4