Malicious PDF — malware analysis report

Static analysis result for SHA-256 873713206f3ba810…

MALICIOUS

PDF

65.3 KB Created: 2020-06-14 19:58:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-15
MD5: 18023ed43448fbdda11d9262b19f68ac SHA-1: c65b68da51cf4c5a904bb1ccbebbaed22f24eb21 SHA-256: 873713206f3ba810f6058477dbe94c7f3bc85538c7306fcd2894079fb17ea8c0
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to seemingly unrelated documents, suggesting a link farm or SEO abuse for malicious purposes. The ML classifier strongly indicates maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://hostmaster.darkrulamedia.uk/uploads/1/3/0/4/130477028/130477028.html#schurken+pvp+guide+4.3 PDF link annotation
    • http://get.excelbusinessintelligence.com/uploads/1/3/0/6/130620840/db44ea6041.pdfIn PDF document text
    • http://sirkett.com/uploads/1/3/0/7/130739508/5860923.pdfIn PDF document text
    • http://mx.countryclubkennelsgrovecity.com/uploads/1/3/0/7/130739348/mofomupu.pdfIn PDF document text
    • http://mail.bottleandcappy.com/uploads/1/3/0/8/130874670/4290506.pdfIn PDF document text
    • http://mta-sts.waynederman.com/uploads/1/3/0/6/130620838/a08b712.pdfIn PDF document text
    • http://hostmaster.gasthofstemarie.be/uploads/1/3/1/6/131606261/6653318.pdfIn PDF document text
    • http://daniel-chavez-moran.net/uploads/1/3/1/4/131438676/nunefelewub_zozaxesegenuwi_tulixurujowot_wesoperotukax.pdfIn PDF document text
    • http://mx.isocinetiquesherbrooke.ca/uploads/1/3/1/3/131384531/kubawo-rabudi-xibizara.pdfIn PDF document text
    • http://mail.fatherjim.com/uploads/1/3/0/8/130874629/50f821448a331c.pdfIn PDF document text
    • http://macrotopia.com/uploads/1/3/1/3/131398182/5429502.pdfIn PDF document text
    • http://chutze.com/uploads/1/3/0/4/130476429/sovinegigoj.pdfIn PDF document text
    • http://lra.org/uploads/1/2/9/4/129455080/129455080.html?vintageIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://nalibavur.files.wordpress.com/2020/06/gezerovosub.pdfIn PDF document text
    • https://duroxonizisi.files.wordpress.com/2020/06/jonajifusugageroza.pdfIn PDF document text
    • https://pitixizan.files.wordpress.com/2020/06/62950961252.pdfIn PDF document text
    • https://bidakujuvob.files.wordpress.com/2020/06/32343652220.pdfIn PDF document text
    • https://digawuxedado.files.wordpress.com/2020/06/watugojototela.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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d21f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD21F 12984 bytes
SHA-256: 7ac9003b444436f63d29ae2a8ca40cf0c0f8cf89224a8e275b0e91bf9112c454

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