Malicious PDF — malware analysis report

Static analysis result for SHA-256 acfaff4a9febd66b…

MALICIOUS

PDF

133.6 KB Created: 2021-04-07 03:56:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 6899dfb45e63e2dbeaef5079ff490569 SHA-1: b15b82bfce0b984151f361062bf1be5b25b9dfff SHA-256: acfaff4a9febd66b435dda2f8714b65d5b43a6153233af015b1152c11d549f99
126 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO spam operation. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the presence of numerous external links suggests an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://fokemale.ru/123?utm_term=barcelona+squad+2016+formation PDF link annotation
    • https://viwetefebelogup.weebly.com/uploads/1/3/1/8/131857445/4619903.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461232/normal_606410ea12bbb.pdfIn PDF document text
    • http://mumolazesinidix.getenjoyment.net/luzepukaledonisaru.pdfIn PDF document text
    • https://tuxufinuzeleki.weebly.com/uploads/1/3/4/7/134737217/9090588.pdfIn PDF document text
    • https://verigidiloje.weebly.com/uploads/1/3/0/8/130874422/fijosisigefig.pdfIn PDF document text
    • http://nutosuvitiraj.scienceontheweb.net/fovomadi.pdfIn PDF document text
    • https://pagopejej.weebly.com/uploads/1/3/5/3/135315805/8509262.pdfIn PDF document text
    • http://jojidasusesot.sportsontheweb.net/alimentacion_complementaria_peru.pdfIn PDF document text
    • https://fomilapemarujan.weebly.com/uploads/1/3/0/8/130814088/gefijesarakebitan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408187/normal_6052f11177c9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422637/normal_60298503a9afd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366639/normal_5fd9b13e6b7aa.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://uploads.strikinglycdn.com/files/7e42e6f0-fa0a-4d27-b3e4-db90b6da5ea1/sopabas.pdfIn PDF document text
    • https://0ea28b16-58c2-472d-b6be-3e97fe9b7bb6.filesusr.com/ugd/696b8a_41fc3f2b29974c0ea83080bd7a242bc1.pdf?index=trueIn PDF document text
    • http://senesijosezetu.myartsonline.com/57976613858.pdfIn PDF document text
    • http://wegugoleta.onlinewebshop.net/fesogobeniwolivu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fba6a5d-9833-4d53-956e-90f73b183739/50341213247.pdfIn PDF document text
    • https://a04ad255-06d6-4b17-97e7-91173d300295.filesusr.com/ugd/6864df_4179a8b4dc564685b036d4fb2f266dfe.pdf?index=trueIn PDF document text
    • https://2f8a6ab9-e864-4757-b083-6627a13f4c48.filesusr.com/ugd/405339_b78e53ac7f5c428dab648a90a6151c3c.pdf?index=trueIn PDF document text
    • https://2c9641c8-5874-4869-9b94-f1378e60aa6b.filesusr.com/ugd/efc1f6_1926f6c8e1954d25bdd3656f6f6c3c21.pdf?index=trueIn PDF document text
    • https://02687da8-bf2b-436b-a8ca-82c6e04513a5.filesusr.com/ugd/e48f8a_3425dfdbff48493f8fca979e76dd5306.pdf?index=trueIn PDF document text
    • https://c7e723d0-7712-45a3-a8dd-8d8935e7c5e2.filesusr.com/ugd/c4f451_f228d826da28471ab40b393471cb0193.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/baeb0d3b-ac01-4c1e-947f-5541156aa5bc/fluid_mechanics_and_fluid_dynamics_difference.pdfIn PDF document text
    • https://4993f9ff-345c-4c03-a8ec-d4f8dac664d6.filesusr.com/ugd/debbe1_9b9c262c2702467d84c2e177577940c9.pdf?index=trueIn PDF document text
    • https://4779f2f8-a33e-4327-9c78-21ee0bcf4620.filesusr.com/ugd/31bf02_8c3ea2ddc644452f92c8ebe8e4171b2b.pdf?index=trueIn 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_off0001b9c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B9C2 5704 bytes
SHA-256: ff562cb30bff9893050ce53052646bee937c275e76da907702d258365646688d
font_01_sfnt_off0001cd07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CD07 14748 bytes
SHA-256: cded3fb956cf0d241ff0d8296d8d4519ceb05fd84f2b33fdca523e073aaeca6e
font_02_sfnt_off0001f996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F996 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176