Malicious PDF — malware analysis report

Static analysis result for SHA-256 0449b79d0ca0752c…

MALICIOUS

PDF

78.6 KB Created: 2021-03-31 04:13:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f559f76b4f4e149c709c76ab736dc296 SHA-1: 7f9b8806385904b6f5051cd8831eed37a7e0f554 SHA-256: 0449b79d0ca0752c9aede7a7975234bfef4704dff7a4eff07ff7f250c0f29b2b
96 Risk Score

Malware Insights

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

The PDF contains an embedded URI that redirects to a suspicious domain, likely as part of a link farm or SEO scam. The document body, though heavily obfuscated, contains keywords related to search terms and the PDF's creation tool, suggesting a lure. The presence of numerous external links, many pointing to benign PDFs, further supports the link farm hypothesis, potentially used to mask malicious activity.

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://leonvi.ru/wix?keyword=haier+smart+tv+specs
    • https://wefupavoxed.weebly.com/uploads/1/3/2/6/132682659/tomatowixaja.pdf
    • https://letotanuvimipe.weebly.com/uploads/1/3/4/5/134598603/tipoten.pdf
    • https://zanixikowupu.weebly.com/uploads/1/3/1/4/131437740/5976581.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dazuxujepov/neolithic_houses_information.pdf
    • https://s3.amazonaws.com/xamapebonijos/46642194990.pdf
    • https://s3.amazonaws.com/jemisajoda/dikaregivitofivakeju.pdf
    • https://92fbd7ca-8480-4723-bb2c-19523f9dca15.filesusr.com/ugd/29946e_4fd1760e015743b181dc86db6a3cf02a.pdf?index=true
    • http://tovezujatim.rf.gd/european_commission_brand_guidelines.pdf
    • https://s3.amazonaws.com/kavifunaruvi/free_color_by_numbers_worksheets_for_kindergarten.pdf
    • http://zejawira.rf.gd/87559236953.pdf
    • https://9aef9be9-4304-4ec6-b02b-ded1eabc5d1b.filesusr.com/ugd/a571b8_c412d3a298784a2dac85f6de65b631c4.pdf?index=true
    • http://kokitivem.rf.gd/22495331485.pdf
    • https://s3.amazonaws.com/zarelusipofox/61900823985.pdf
    • https://s3.amazonaws.com/xopugup/8819397995.pdf
    • https://s3.amazonaws.com/tojazudibumogab/samsung_m2835dw_wireless_setup_windows_10.pdf
    • http://kolenexe.epizy.com/information_about_mercury_in_tamil.pdf
    • https://s3.amazonaws.com/gatazeromij/wedisofumikiwizegige.pdf
    • https://s3.amazonaws.com/nademopor/gapixoradukegupajav.pdf
    • https://f72e0e13-a873-49c5-9cb5-3c2848b8c5b2.filesusr.com/ugd/f8ba4b_b8eb67ccc90d4ca8a5605cc49e127fd5.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7f2.bin
c4317010fc0a7453bd5109a13f6b7d339e96395a30d9ec8a670968db9feb1ae5
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F2 5068 bytes
font_01_sfnt_off0001091e.bin
74525a989cd15fdb139bb3452f0ceaac2c610165e9bc95692116657d7fbe6395
pdf-font-stream PDF embedded font (sfnt) at offset 0x1091E 10612 bytes