Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a03faca33596a6a…

MALICIOUS

PDF

76.7 KB Created: 2021-03-10 10:25:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 90b28732111e4a7c5fc12a2d599c722e SHA-1: 996abe1a91907174e3d41b887addfa0b97623070 SHA-256: 3a03faca33596a6a148856b4441204bdca2e94036c2d736675240efc1d0a671e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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/award?keyword=ccna+data+center+pdf+arabic PDF link annotation
    • https://cdn.sqhk.co/nakizenonetu/fjYxjaR/love_and_respect_workbook.pdfIn PDF document text
    • https://cdn.sqhk.co/nawiwola/jNlpuVf/runekogoju.pdfIn PDF document text
    • https://cdn.sqhk.co/zifiguwosu/hjhfjhk/50352628890.pdfIn PDF document text
    • https://cdn.sqhk.co/girewobo/hjhgvid/beginner_cross_stitch_flowers_easy.pdfIn PDF document text
    • https://cdn.sqhk.co/linewebozid/mjc0ghd/zukikosilafefub.pdfIn PDF document text
    • http://ses-paypal.com/47999764468dx7wo.pdfIn PDF document text
    • https://cdn.sqhk.co/ketalidukepi/dijhpgd/singtel_top_up_card_data.pdfIn PDF document text
    • https://cdn.sqhk.co/sebuwemid/bVjdhdy/debomil.pdfIn PDF document text
    • http://present-mag.ru/79305050082mijrs.pdfIn PDF document text
    • https://cdn.sqhk.co/mimotulifoti/MRRjjo0/amazon_prime_video_roku_issues.pdfIn PDF document text
    • http://prizinsta.online/exemple_de_fiche_de_lecture_ifsilk2kw.pdfIn PDF document text
    • http://reduslimitalia-ufficiale.site/nugefutibupisotuwoxemokil06426.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://b3df6b87-ca8d-4c26-b815-8c697753997b.filesusr.com/ugd/896a32_12c6303986074b208ae91ebb689e216c.pdf?index=trueIn PDF document text
    • https://29159626-56e2-4eb2-a8c1-eb081f451e44.filesusr.com/ugd/a58502_192cc4eda0254467b3c4dccc78ec2db1.pdf?index=trueIn PDF document text
    • https://506dbbd1-d4b3-44b1-a4c9-6b5d0cab6a23.filesusr.com/ugd/c75f60_473960d291814f19a6ecd0335c39b64f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/153ebe2e-7016-4bbf-8c96-a91b0d4c6e0c/tukewalos.pdfIn PDF document text
    • https://16fd3b15-5541-4454-9538-28daacbf497e.filesusr.com/ugd/e32576_22d66b4ded7641f8bfe0ad268042e7e9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/18f0b06b-7bd3-453a-989a-857dc745a473/xuferorekiwodonugugig.pdfIn PDF document text
    • https://656adf98-7a81-40bd-8d0f-2b9c27d09201.filesusr.com/ugd/268ab1_f4c911f17bfb427f9ef945262586d4d1.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_off0000e2fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FB 4780 bytes
SHA-256: 2b05e70948aee76a1344621f8f1df8fd0951757a40274d4aeebb17aebef13a98
font_01_sfnt_off0000f336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF336 10804 bytes
SHA-256: 6d929443a4565d91e5311ef95b34c5180f38982d1e75fca4f11c81c43f22e591
font_02_sfnt_off000117af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117AF 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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