Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfe54b44da4a1ab0…

MALICIOUS

PDF

40.4 KB Created: 2020-06-13 05:03:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-07-24
MD5: 4f4064246fc8088f9a4cbee3b7a9db3e SHA-1: ea283d2982bb0c8ff7896ed37ab9ea3fd1db3b4e SHA-256: dfe54b44da4a1ab0c7fcd19dc0fb20880fdc82a91d1583a84101ac91dac15e42
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO spamming operation. The document body, though partially corrupted, contains text related to 'Matemáticas tercer grado' and the wkhtmltopdf application, indicating a potential lure. The embedded URLs point to various domains, many of which are structured similarly, reinforcing the link farm hypothesis. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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 http://oururbanadventure.com/uploads/1/3/0/6/130621501/130621501.html#matem%25C3%25A1ticas+tercer+grado PDF link annotation
    • http://caitlinmorrison.com/uploads/1/3/0/5/130588268/f5f0713850d.pdfIn PDF document text
    • http://tt123.w33blyqa.com/uploads/1/3/1/0/131070574/gasuvipogoxofi_rixixuxez_sulasotis.pdfIn PDF document text
    • http://gloriaanholt.com/uploads/1/3/1/4/131453588/mokabusiru.pdfIn PDF document text
    • http://legacylegalconsulting.com/uploads/1/3/1/8/131857315/6795225.pdfIn PDF document text
    • http://3pu.undesirable.us/uploads/1/3/1/6/131607237/663068.pdfIn PDF document text
    • http://buildmaui.net/uploads/1/3/1/4/131453402/sinewuzokanex.pdfIn PDF document text
    • http://autodiscover.fitzscoonshack.com/uploads/1/3/0/5/130588542/jukirozugo.pdfIn PDF document text
    • http://everydaycontemplative.ca/uploads/1/3/0/5/130551187/5198444.pdfIn PDF document text
    • http://kometaniassociates.com/uploads/1/3/1/3/131383726/midujegupukunotij.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://pesodugib.files.wordpress.com/2020/06/juvaxejisurekufenimer.pdfIn PDF document text
    • https://pabozig.files.wordpress.com/2020/06/guwugujonetememelinog.pdfIn PDF document text
    • https://kemimabaz.files.wordpress.com/2020/06/gunagabenabagomijo.pdfIn PDF document text
    • https://zamavudipapi972949676.files.wordpress.com/2020/06/niruvad.pdfIn PDF document text
    • https://xefipun.files.wordpress.com/2020/06/pepabamugevava.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

Related samples 4

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000598e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x598E 11648 bytes
SHA-256: a3174584879144915ec823e38d2426ed3bf6c1650908542ce44f96dfb1253d23
font_01_sfnt_off00007f8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F8B 16076 bytes
SHA-256: bf579d611c27de2154a89ecc3d85698c773a9b94e3a26cd31ae1925493c8327e

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