Malicious PDF — malware analysis report

Static analysis result for SHA-256 b968c5d4f537cdb4…

MALICIOUS

PDF

74.6 KB Created: 2021-03-29 08:52:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 263f430d48edae1fc4c1344dcd851d2e SHA-1: a929c4193d7715d72f7d77317acf149bd89c6cbb SHA-256: b968c5d4f537cdb47cd136b0e889e9fd77b6a0729136d244fd56f162db854114
106 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF document flagged by ML classifiers as malicious. It contains numerous embedded URLs, many pointing to disposable domains or link farms, suggesting a phishing or malware distribution attempt. A key heuristic indicates the document instructs the user to copy and paste content into a shell, a common technique to bypass security controls and execute commands. While no scripts were extracted, the combination of the lure and the embedded URLs strongly suggests an attempt to trick the user into executing a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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/wix?keyword=wifi+file+transfer+pro+apk+onhax PDF link annotation
    • https://vefoxetewezelir.weebly.com/uploads/1/3/1/4/131483279/b63794.pdfIn PDF document text
    • https://rogujodur.weebly.com/uploads/1/3/4/8/134899240/e3d60ce5.pdfIn PDF document text
    • http://naturebiolog.fun/netgear_wnr1000_router_loginnx9f6.pdfIn PDF document text
    • http://checkmycredit.info/50506342655o8tk5.pdfIn PDF document text
    • http://mikrotikwizard.com/67401516792ugu9d.pdfIn PDF document text
    • https://lumodafudewose.weebly.com/uploads/1/3/4/4/134480169/80f8cb88f0.pdfIn PDF document text
    • https://sojenakituvewo.weebly.com/uploads/1/3/3/9/133986345/mixavabok_paxexezotedi_xinuwereg_nizopowifivuf.pdfIn PDF document text
    • https://wepusiviji.weebly.com/uploads/1/3/4/6/134661614/farar-risovoxid-leneg-miwowim.pdfIn PDF document text
    • https://faxipanonuk.weebly.com/uploads/1/3/4/3/134352952/tunikezo.pdfIn PDF document text
    • https://jawutasujo.weebly.com/uploads/1/3/0/9/130969833/1206623.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cfe78d1-c4eb-4ddd-a28c-06f7722955ca/femanedotesu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ee4163f-fc21-47d2-b40c-d1a136ce241b/51890578908.pdfIn PDF document text
    • https://s3.amazonaws.com/dikobepibelun/274509860.pdfIn PDF document text
    • http://tudutov.rf.gd/pasefaxiranegoteke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de2b6874-45b2-4004-908e-00c27e109de4/does_whitebeard_really_have_a_son.pdfIn PDF document text
    • https://s3.amazonaws.com/ritoma/37473787617.pdfIn PDF document text
    • https://s3.amazonaws.com/lorerexeg/hillsborough_county_high_school_baseball_schedule.pdfIn PDF document text
    • http://xonifovozub.epizy.com/google_spreadsheet_api_c.pdfIn PDF document text
    • http://nuxesidedojo.epizy.com/centrifugal_compressors_free.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_off0000e442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE442 5132 bytes
SHA-256: 30be12931e2a3445d29b8886e6f79782d59e4ef1f85ed3e762329cd204c0e6c2
font_01_sfnt_off0000f5c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C8 11744 bytes
SHA-256: f0489d79ee2018c161ba00ffbd40ca2c3a18027da69ed3e116be995ec4984f78

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