Malicious PDF — malware analysis report

Static analysis result for SHA-256 16dcbf2bf1abf614…

MALICIOUS

PDF

77.5 KB Created: 2021-03-22 07:16:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: cd73d5fd5bff2f129876381d926b609b SHA-1: 158b9f2b9a45d0dcebabb163c70e710d65ff7cfc SHA-256: 16dcbf2bf1abf61447406991c5b4f0188700aadc80e76d1568ba158672d2af35
186 Risk Score

Malware Insights

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

This PDF sample was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains a large number of external URIs, many hosted on disposable domains, suggesting an attempt to manipulate search engine results or distribute malicious content. While no scripts were explicitly extracted, the PDF structure and extensive linking are indicative of a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://golowaki.ru/award?keyword=lars+brownworth+pdf PDF link annotation
    • https://lelopotive.weebly.com/uploads/1/3/0/7/130738546/zefupitekisali.pdfIn PDF document text
    • https://gubijebe.weebly.com/uploads/1/3/1/4/131483267/2132353.pdfIn PDF document text
    • http://vibijinit.scienceontheweb.net/39717499361.pdfIn PDF document text
    • http://uscreditmonitoring.info/peter_pan_and_wendy_movie_2020osxbl.pdfIn PDF document text
    • http://copyrightsafetyhelps.com/london_metal_exchange_prices_base_metalss992u.pdfIn PDF document text
    • https://dunevija.weebly.com/uploads/1/3/4/3/134306837/nofojuzorul-tadizujilu-joxiriw-nagikepure.pdfIn PDF document text
    • http://gratoramaa.space/47298911427ru21m.pdfIn PDF document text
    • https://bajerezera.weebly.com/uploads/1/3/4/0/134016740/1784664.pdfIn PDF document text
    • http://indohealth365.online/beef_barley_soup_nutritional_information6g5ix.pdfIn PDF document text
    • http://xemokajoled.medianewsonline.com/washing_machine_repair_parts.pdfIn PDF document text
    • http://winoxolupuvil.getenjoyment.net/14879764249.pdfIn PDF document text
    • http://medyahanem.com/zuzipanipmescj.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/2af1e059-12f0-49af-8a43-e77784af4b9b/75519149223.pdfIn PDF document text
    • https://05282879-aed3-4f16-ac14-d534add4d4bd.filesusr.com/ugd/0f8b7c_e530eb9679ec4477817525adca98528d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/72cc939c-727f-410b-97ba-c35a11c3021f/jebesogutomigoserekoloni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a8153ee-5377-42a3-8b75-ec4a88040292/xobixubupisajum.pdfIn PDF document text
    • https://02796127-04ec-4c85-b270-c6f7310ebb18.filesusr.com/ugd/ce0e6d_ff55792358a546a5a5afd85ea58493b3.pdf?index=trueIn PDF document text
    • https://50bf384a-eeac-4f26-a262-e2ba1a5e00ba.filesusr.com/ugd/17159d_97d3b581136742a8944588c56d9700b4.pdf?index=trueIn PDF document text
    • https://4465b75e-e642-4f53-8c89-e22f0b9d4994.filesusr.com/ugd/ecd213_76b77d9b551d4855a2a3dca28a494d42.pdf?index=trueIn PDF document text
    • https://e29a9437-b0a5-48a6-9afa-908397ce514a.filesusr.com/ugd/16a9c1_92d654323365492f9db476a94d894ec9.pdf?index=trueIn PDF document text
    • https://37bdae34-bb2f-403f-997c-54a7c09d9c06.filesusr.com/ugd/dc98cc_06e219969efd435294b67025cb734ff3.pdf?index=trueIn PDF document text
    • https://858e1da1-ad31-4e5b-aec0-89c59c6c71f6.filesusr.com/ugd/6240f8_68ed3216ad404ef7b2e0573141cdb643.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dd492c7-a6dd-47cc-bb8d-670b03cd161c/how_long_before_babies_go_into_deep_sleep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d23b1bd4-927b-434c-b0d0-e271ae51de59/computer_networking_a_top_down_approach_chapter_3_solutions.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_off0000f16f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16F 5268 bytes
SHA-256: 175d83457e176a015105023942319a082025db912fae8fce69d5dd21533f1206
font_01_sfnt_off00010365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10365 10932 bytes
SHA-256: b84dbc0ebe4da5720c7fa3d89791fc65c599dde218a0bbded87ab8b36a0d6586

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