Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7738b2346502abd…

MALICIOUS

PDF

77.5 KB Created: 2021-04-03 20:33:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 6103cf6a6dff3c3122555075bb51495f SHA-1: 4fca22079b40caa23ce1390bcf4659c9e95c3a57 SHA-256: a7738b2346502abd71bb6d23c298258cc95ee6d2c22a480552cee282ec1343af
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with many pointing to disposable domains and exhibiting link farm characteristics, suggesting a malicious intent to redirect users. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the presence of many external links indicates a potential for downloading further payloads or leading to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://cdn.sqhk.co/savageven/ib9hjeS/voice_recorder_app_download_for_android.pdf In PDF document text
    • http://help-lnstagramcopyrights-verify.com/12117905710cxc6r.pdfIn PDF document text
    • https://cdn.sqhk.co/sotisajen/cKKjggS/coda_definition_music.pdfIn PDF document text
    • http://outputqwvk.space/68101040747ht1ui.pdfIn PDF document text
    • https://cdn.sqhk.co/zijigemeworu/fhcQhgR/gugomadosobiperudenemetob.pdfIn PDF document text
    • http://bitcoinlearningcentre.online/tunakaloxiruwu4cb3.pdfIn PDF document text
    • http://card2card.live/marvel_schebler_carburetor_10a_355_rebuild_kitr3am6.pdfIn PDF document text
    • http://shopwithsale.website/denunikufwezm.pdfIn PDF document text
    • https://cdn.sqhk.co/dipimimimewi/8ijjggc/75515753564.pdfIn PDF document text
    • https://cdn.sqhk.co/xepiriza/bQ4Y1JT/50199202191.pdfIn PDF document text
    • http://myirn.icu/resifirhjbbs.pdfIn PDF document text
    • https://cdn.sqhk.co/jasurisunav/hF9v8if/banana_blast_game_walmart.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/Xr6F2PkPTcg/wb?keyword=how%20to%20turn%20on%20a%20us%20craftmaster%20water%20heaterPDF link annotation
    • https://uploads.strikinglycdn.com/files/abe3c154-80f4-4eb0-9736-fc898345976c/guvakorevitipijamir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2c654aa-007f-42aa-8469-c53142f1722b/99456031874.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83e723c3-3ab7-47a8-a80a-f348051cf1e3/sony_tmr_rf985r_wireless_headphones_battery_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aada302d-f4d7-45a5-84d1-d1107ddd4a57/7_day_mind_diet.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_off0000f1fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FB 5144 bytes
SHA-256: f3855c5f1cfc249c0a3f4286266ab1e5ce80dfb3edf7bba96281f6a4ddb385e5
font_01_sfnt_off00010360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10360 10548 bytes
SHA-256: 254e7521a95032464a93e548919f65da7f2e7f115f12ad8d9a556711992b74f1

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