Malicious PDF — malware analysis report

Static analysis result for SHA-256 f958c1e1977beb7f…

MALICIOUS

PDF

84.2 KB Created: 2021-04-02 23:28:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: fc436fbd38fd597414bf89fdfdee3a7b SHA-1: 70494049d83df35bb6fe74a78b5145461698ca7c SHA-256: f958c1e1977beb7f1f5d45b3c73e66d3fe816d462db2fdd64a63b60db0564cdd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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.
  • 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://leonvi.ru/strik?utm_term=ps3+controller+on+ps4+reddit PDF link annotation
    • https://cdn.sqhk.co/wamamuli/ashfhc9/bachelorette_party_invite_template_free.pdfIn PDF document text
    • https://cdn.sqhk.co/xulawajikigi/hcMjjEj/michael_reeves_ding_ding_website.pdfIn PDF document text
    • https://wajogivetiwi.weebly.com/uploads/1/3/4/3/134322864/xalofoneg.pdfIn PDF document text
    • https://zonozedu.weebly.com/uploads/1/3/0/8/130874021/wirofez.pdfIn PDF document text
    • https://kuxobemif.weebly.com/uploads/1/3/1/3/131379353/6d1d731.pdfIn PDF document text
    • https://wezunemoxojo.weebly.com/uploads/1/3/5/3/135321606/4569123.pdfIn PDF document text
    • https://kadimonadi.weebly.com/uploads/1/3/4/4/134491006/4812754.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://0e098354-e5d1-4afc-9be7-763a70ae5e44.filesusr.com/ugd/ef253e_f136798887664ca8ab7cb84e7e16d01a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/743d272b-aefc-4702-b293-16413b776430/how_to_change_alternator_on_2005_nissan_frontier.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fbe8fcd-e7bb-4667-bd86-30cd5f395255/6759659988.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bfb043e-a5df-4b36-bbe4-77d16bdebdc8/what_are_the_harry_potter_team_names.pdfIn PDF document text
    • https://abe99a74-823b-4c5d-85d6-f8d8de52422f.filesusr.com/ugd/73cc63_2af755de70a54faf8f880869d477c930.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6449ecda-b281-49bf-ba12-69dd0fc8ec5a/define_microeconomics_for_dummies.pdfIn PDF document text
    • https://09af0a6c-c0e6-47ff-90c1-5b173435ccd1.filesusr.com/ugd/b92b66_3103c47ae0ca4a71be4db0b689c5481d.pdf?index=trueIn PDF document text
    • http://nupuwabubud.epizy.com/importance_of_protected_areas.pdfIn PDF document text
    • https://d5bea983-5bca-41ba-aae6-6b688785cc77.filesusr.com/ugd/9ec29b_25bdc55f8f5c4de29f93d8cc7e645410.pdf?index=trueIn PDF document text
    • https://e05653fc-386e-4c8b-889d-738aee72c63e.filesusr.com/ugd/62421a_b50299f853064afca9bc29b9901340a4.pdf?index=trueIn PDF document text
    • https://684917c6-b594-4497-9ea4-141105166a5b.filesusr.com/ugd/0dc9f5_57be711d606f4ed9be9cc0b622611e28.pdf?index=trueIn PDF document text
    • https://3682d434-6e27-4ac8-9ac2-d3ec24fa429c.filesusr.com/ugd/9b5f63_2d770496f7fb4b5b8f1d5f4d9686a5d9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b1890a2-a77f-4b66-9455-1fec885aa0d3/30315215531.pdfIn PDF document text
    • https://734e8db3-b9db-457c-abaa-08c06218e7ae.filesusr.com/ugd/f6bb82_bc334ef55761474596b3dc65c0e63bad.pdf?index=trueIn PDF document text
    • http://wijexaxowakovan.rf.gd/invite_to_event_email_template.pdfIn PDF document text
    • http://mabazekow.epizy.com/banking_awareness_download_bankers_adda.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA6 4900 bytes
SHA-256: e718d88cdc2e73ae3d18cacd92bfca28f36350368a8c08b26475593a813afb44
font_01_sfnt_off00010f4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4E 10964 bytes
SHA-256: 4c303d4a9e59a0e276586abf53c83ad06727e6a9e1482eee6a91ad6db481569d
font_02_sfnt_off000134d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D2 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230