Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f7928a38c8478a7…

MALICIOUS

PDF

117.8 KB Created: 2021-05-12 15:58:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 46c796765cdfd9df61240ba601c348f5 SHA-1: 9e76ace78f358f769be294531858f8e1e78ab297 SHA-256: 0f7928a38c8478a7c76a169c4108272915b73573317b30d88522d0c88c62d694
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to be a lure related to anime search terms, likely intended to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://jacksth.ru/strik?utm_term=where+does+one+punch+man+anime+end+in+manga PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369331/normal_5fdf81c9f37d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393041/normal_60582fcfdeae0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367959/normal_6061f2edcd703.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404285/normal_5ff416c6e604e.pdfIn PDF document text
    • https://subijiderekura.weebly.com/uploads/1/3/4/6/134616270/mowoponozu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496380/normal_6023fc1190991.pdfIn PDF document text
    • https://wawupibinotab.weebly.com/uploads/1/3/4/9/134900246/pimofonirupob-tuvekusuw-vobokag-juvedutexif.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/e3515cbf-ac62-4986-ab00-8cfcdfe534e7/kerelegevokibavasoxavezo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67058408-2dc8-48a4-8b22-63ba2a0b3df4/80190245320.pdfIn PDF document text
    • https://s3.amazonaws.com/jebupofedijakuk/harry_potter_book_1_ar_test_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a06ed79d-c6f3-4491-bccb-45e7f672a01c/tetonanopusarunilow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/393b58d0-b806-4897-9b79-f60e1774efab/jalimori.pdfIn PDF document text
    • https://s3.amazonaws.com/jazuravazaguz/request_uk_passport_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99ba7caa-a66a-4f5c-a9f0-a7959550c115/kidafufovuveritufadekowon.pdfIn PDF document text
    • https://50037ee0-0691-4a53-bdc2-b2f8f795cfa6.filesusr.com/ugd/b41a9a_85a11f1b4bff408ea51ddb1c9ebe9463.pdf?index=trueIn PDF document text
    • https://2e4b0ed6-c237-476e-b23b-7c95f147629f.filesusr.com/ugd/30e930_1baef84f47694c7bba77b96ab6c617bb.pdf?index=trueIn PDF document text
    • https://b8f7bc2e-5f90-466c-a76c-b8215bfdb3ae.filesusr.com/ugd/9717d9_896fff10aae2476088efb3c403b972cf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vukujidor/vomasa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9638c3cf-2be3-451a-ae80-a344d2fbfce0/brandon_lee_the_hills_dating.pdfIn PDF document text
    • https://1b2c4efd-c8eb-4b04-b26f-b9154d704720.filesusr.com/ugd/d3758e_6cdcc4561dc14444855330e3a73332c0.pdf?index=trueIn PDF document text
    • https://436010f1-0dd7-4950-aec0-3bdf337573e8.filesusr.com/ugd/5a4c69_5a99f108f6734133ac123ed040289c46.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e1b23fa-738a-4ba3-80e1-b17703fea599/koxekojulogofefegobi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2629e83-208c-40c9-a797-b22befeb72c6/types_of_machine_learning_tutorial_point.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001539a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1539A 6700 bytes
SHA-256: 2b40056475635b1b1fa0099be8620c27e83d6b83ffcfa22a854c34134e364913
font_01_sfnt_off00016ab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AB0 5468 bytes
SHA-256: 82cd5638da3996eb04c51461cf0d847fabec35c5229e19cb67ecae2ad92258d9
font_02_sfnt_off00017d2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D2C 14644 bytes
SHA-256: ee501c4d4dcfded78b9e9a9a259b6343395e35763be4fcac86ae100f09af3b57
font_03_sfnt_off0001ac37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC37 17780 bytes
SHA-256: 321a8d2f475f5a49f0b94499c16d05bf79ab86dea02cec624c09c66cc40ea043