Malicious PDF — malware analysis report

Static analysis result for SHA-256 c97af1c281dc65e9…

MALICIOUS

PDF

53.7 KB Created: 2020-11-06 12:55:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: fe9540a6bc3eb718d695ebb24fdfbc4c SHA-1: 7cf5db49b0744e2c37b82c47b336fb37acbb4786 SHA-256: c97af1c281dc65e90531f404a92f06646c501e216589ab531762fc8d4543429a
134 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The ML classifier strongly indicates maliciousness. The presence of a 'download' button lure further supports a malicious intent to trick users into clicking through these links, likely to download further payloads or visit phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafftec.ru/aws?keyword=hellboy+2019+123movies+hd PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387715/normal_5f931576cfa3d.pdfIn PDF document text
    • https://kabudededawizo.weebly.com/uploads/1/3/1/3/131383409/gamigakusujusul.pdfIn PDF document text
    • https://zopofaxomape.weebly.com/uploads/1/3/4/3/134372760/zafuxoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387408/normal_5f8f3241e192c.pdfIn PDF document text
    • https://gujojiri.weebly.com/uploads/1/3/4/4/134434224/lidededugobaw_nawuk.pdfIn PDF document text
    • https://kagilovudugavap.weebly.com/uploads/1/3/1/1/131164538/kewivijexuxowisaji.pdfIn PDF document text
    • https://segakimorepej.weebly.com/uploads/1/3/0/7/130738797/gopevinopujonute.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369143/normal_5fa4f63462ebd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368756/normal_5fa51cb7c82b9.pdfIn PDF document text
    • https://xaxexapiro.weebly.com/uploads/1/3/1/4/131453807/gatajizoruxaze.pdfIn PDF document text
    • https://logekififej.weebly.com/uploads/1/3/4/5/134502341/3401399.pdfIn PDF document text
    • https://pujuferot.weebly.com/uploads/1/3/4/6/134657525/bebosaji-pedil.pdfIn PDF document text
    • https://fogakorix.weebly.com/uploads/1/3/3/9/133997140/pemijugemorapek.pdfIn PDF document text
    • https://wiwazalokapig.weebly.com/uploads/1/3/4/2/134265383/42bf8d1.pdfIn PDF document text
    • https://fobaripiso.weebly.com/uploads/1/3/4/4/134443650/1206133.pdfIn PDF document text
    • https://jalewigevat.weebly.com/uploads/1/3/2/6/132681207/a447fa5a.pdfIn PDF document text
    • https://zesojewati.weebly.com/uploads/1/3/4/4/134432656/jefaxilelivajexef.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
    • 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_off00006eb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EB7 5268 bytes
SHA-256: 58dd711b6bb17f470f0d31af67962344a285b9252e0af9695fe97b78f971d2bb
font_01_sfnt_off0000809e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x809E 11000 bytes
SHA-256: 10a8e606eab599c88abe315fe53b60a2d87ab73e337e4fa8e9b5d2a167694974
font_02_sfnt_off0000a61b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA61B 16168 bytes
SHA-256: d98b328ac7b3f122034741a02ab45659b29e798565926f0a20da43a7c35a6047
font_03_sfnt_off0000bb22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB22 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230