Malicious PDF — malware analysis report

Static analysis result for SHA-256 7011fe6af6f8ae35…

MALICIOUS

PDF

117.0 KB Created: 2021-05-28 14:30:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: d3dbde6cb9dc9e70da8d6d376d69f637 SHA-1: 50ef4eaa93796f952e2dc6801c9891106ec46a00 SHA-256: 7011fe6af6f8ae3584c71ed30b7a6359badbe222359d782044aaee8a40a4f842
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. The primary URL, 'https://nipisod.ru/123?utm_term=guia+ada+2018+espa%25C3%25B1ol+pdf', suggests a potential phishing or spamming campaign. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • 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://nipisod.ru/123?utm_term=guia+ada+2018+espa%25C3%25B1ol+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366947/normal_601e43ea29b32.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455180/normal_606a1e8f76ce4.pdfIn PDF document text
    • https://ruvazokof.weebly.com/uploads/1/3/4/0/134040659/593068165.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475588/normal_5ffe269968357.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427295/normal_6000fe33a91ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413361/normal_603ea52672e3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474992/normal_5fea24e276a1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425238/normal_60152f45cb540.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450513/normal_5fe98fbfc6c56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383566/normal_602ce2303a5c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459780/normal_601dea21e5765.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383137/normal_60681720099d7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444370/normal_5fffb19130a19.pdfIn PDF document text
    • https://xufujakuzizam.weebly.com/uploads/1/3/5/3/135315974/2648758.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/ba9ba520-60ed-4f34-8f55-e40a645dfb54/affiliate_marketing_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0eb44dbc-5a74-4ad3-b19a-a3f505635026/what_word_ends_in_lyze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f3dc299-2c0d-4d0f-a9ae-ad0cb6dea5b0/where_to_buy_coway_ap-1512hh_in_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/597033ac-41de-404b-ac40-ff610184dc76/how_to_set_up_keurig_2.0_water_filter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11183dd5-af1a-4465-bf37-414a29c196d9/4527861280.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_off00018864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18864 5700 bytes
SHA-256: 5728861b4a6f5bb70acbd250d083415d0dfd890461e92a271a7a8e4a381873cb
font_01_sfnt_off00019ba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19BA8 12504 bytes
SHA-256: d00529c86b706d941cc3b1f6642a36b73be9e70d2f57ec46a68b81a7129091de

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