Malicious PDF — malware analysis report

Static analysis result for SHA-256 a33de9acfa5471e0…

MALICIOUS

PDF

50.1 KB Created: 2020-03-28 04:38:39 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-07
MD5: a0cad76c550c0fbac8d295d29acef10a SHA-1: 8fd48739ac2634532ab5fadb9aeda4c99f0edf31 SHA-256: a33de9acfa5471e018916309bd0d1a99af461045744030f3737e69ce89f76139
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links pointing to other PDFs hosted on various domains, indicating a link farm or redirection scheme. The document body text, while partially obfuscated, includes a URL that is part of this network. This pattern suggests the PDF is used to drive traffic to these external resources, which could be hosting malicious content or engaging in SEO manipulation. No scripts were extracted, and the primary malicious activity observed is the extensive linking.

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://entrepreneurssuccessformula.com/uploads/1/3/0/8/130813992/130813992.html#oraciones+subordinadas+adverbiales+q+es PDF link annotation
    • http://encounteringantipolonism.org/uploads/1/3/0/5/130588451/648ffac4.pdfIn PDF document text
    • http://militarywarriorhunt.com/uploads/1/3/0/2/130289693/jatizagix.pdfIn PDF document text
    • http://nvcvb.net/uploads/1/3/0/4/130476327/8837973.pdfIn PDF document text
    • http://paellaverhuur.com/uploads/1/3/0/7/130739827/0fde22.pdfIn PDF document text
    • http://tesshintelmann.com/uploads/1/3/0/6/130639121/redoz.pdfIn PDF document text
    • http://blushingflowerco.com/uploads/1/3/0/3/130380084/6196480.pdfIn PDF document text
    • http://chokola.com/uploads/1/3/0/2/130287960/2cbfbbfe6a.pdfIn PDF document text
    • http://brooklynklaassen.com/uploads/1/3/0/6/130620612/binikoxolobuj.pdfIn PDF document text
    • http://ihartvoyage.com/uploads/1/3/0/6/130621182/bb531e0.pdfIn PDF document text
    • http://socalhondadealershelpful.com/uploads/1/3/0/2/130273845/9595109.pdfIn PDF document text
    • http://hostmaster.decide4u.ch/uploads/1/3/0/8/130813831/f7f60a.pdfIn PDF document text
    • http://www.lowcountrylabradoodles.com/uploads/1/3/0/6/130620819/mamubew.pdfIn PDF document text
    • http://bigclifftrailbuilding.com/uploads/1/3/0/5/130588830/2681663.pdfIn PDF document text
    • http://luciestarr.net/uploads/1/3/0/2/130273987/c8a21e1ed4a.pdfIn PDF document text
    • http://nzeventsnz.org/uploads/1/3/0/6/130604304/mefinulamapo.pdfIn PDF document text
    • http://paperfreeinventory.com/uploads/1/3/0/3/130379049/likaw_zuxiwaz.pdfIn PDF document text
    • http://sophysinger.com/uploads/1/3/0/4/130488812/a5cefd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicenseIn PDF document text

Related samples 8

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_off0000919b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x919B 8592 bytes
SHA-256: 41e0e47f615765905c9e04a9798daeee37f854969aae920dcea50ab4c89aadc1
font_01_sfnt_off0000b112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB112 2652 bytes
SHA-256: e2f1373bf3d70a40ff4276a486f0a1d2d32154e4f45ad1243a44c3d3b7d91cea

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