Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7adb96fe1cef55c…

MALICIOUS

PDF

68.6 KB Created: 2021-02-16 04:29:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e64d4a95d133e6cb78e612e6a642e5f4 SHA-1: c8d1002f92937bed60f14d26e39db6cd9f4b0d29 SHA-256: f7adb96fe1cef55c0a61807aa2e56c4c79909621358e544c9d8b30d183addc38
96 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO link farms and potentially distributing malware. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to external sites, likely for further exploitation or content delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/123?utm_term=php+black+book+pdf+free+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4448980/normal_5fc7c5dabcf89.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450259/normal_5fec59baf1670.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369796/normal_6018f483da777.pdfIn PDF document text
    • https://tigigedilopufam.weebly.com/uploads/1/3/5/4/135400960/3099632.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410975/normal_6007dfbecf145.pdfIn PDF document text
    • https://xutativapejan.weebly.com/uploads/1/3/4/5/134521393/8527930.pdfIn PDF document text
    • https://teditiwos.weebly.com/uploads/1/3/2/6/132681477/fadamolomuxu.pdfIn PDF document text
    • https://nuvisinuxaxo.weebly.com/uploads/1/3/1/3/131383681/7020923.pdfIn PDF document text
    • http://hotsales-com.xyz/rimoxekuranojetenulu8.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://danofawo.rf.gd/67782548223.pdfIn PDF document text
    • http://kajalefaruw.epizy.com/xuwubowo.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwuxot/betternet_free_for_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/andaman_islands_tour_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wumodukubaru/69690955956.pdfIn PDF document text
    • https://s3.amazonaws.com/julexekubaj/51022103463.pdfIn PDF document text
    • https://s3.amazonaws.com/vapelurowar/denotation_connotation_exercises_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/gopuze/here_i_am_lord_piano_sheet.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2B2 5020 bytes
SHA-256: 2e4706883849d175aa5f3f686e0fd0547f98aa983deb7edb9e4c11f30a5ca774
font_01_sfnt_off0000d3b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B1 10384 bytes
SHA-256: d6e90e7fd2df31a540c2b5e828496fbd87c6bae7fc0b137da021917910b06652
font_02_sfnt_off0000f751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF751 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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