Malicious PDF — malware analysis report

Static analysis result for SHA-256 515eaa6edafb0a53…

MALICIOUS

PDF

34.7 KB Created: 2020-06-02 05:17:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 7757812501ac69ae7d8728e6ec8eabce SHA-1: e38dc671bbb0377308e8204a9a25bc55de3cf34b SHA-256: 515eaa6edafb0a53ee248d37818648418845a2efae7da00eda31f550bd16e947
136 Risk Score

Malware Insights

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

The PDF document contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body, though partially corrupted, contains text related to 'Ejercicios de presente simple vs continuo' and mentions wkhtmltopdf, suggesting it might be a generated document. The primary attack pattern involves directing users to a large farm of external URLs, likely for SEO manipulation or to host further malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://riccijustisart.com/uploads/1/3/0/7/130775818/130775818.html#ejercicios+de+presente+simple+vs+continuo PDF link annotation
    • http://twoguysandabroom.com/uploads/1/3/1/0/131070894/duketunefimot-kitam-badukibovoxiz.pdfIn PDF document text
    • http://feature.yuuzuu.co.uk/uploads/1/3/0/8/130874350/9513565.pdfIn PDF document text
    • http://olympiasts.com/uploads/1/3/0/5/130588924/xabuba_gavipokolonaw_zeralal_felizimov.pdfIn PDF document text
    • http://jgmow.com/uploads/1/3/1/4/131437472/vusuzibok.pdfIn PDF document text
    • http://elkhartcottagecarecrystalcottagecare.com/uploads/1/3/0/9/130968921/515401.pdfIn PDF document text
    • http://1a2.undesirable.us/uploads/1/3/0/6/130620909/kozajenut.pdfIn PDF document text
    • http://riccijustisart.com/uploads/1/3/0/7/130775818/terms.htmlIn PDF document text
    • http://riccijustisart.com/uploads/1/3/0/7/130775818/dmca.htmlIn PDF document text
    • http://riccijustisart.com/uploads/1/3/0/7/130775818/policy.htmlIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://lavasotesug.files.wordpress.com/2020/05/xifos.pdfIn PDF document text
    • https://sujefeg.files.wordpress.com/2020/05/69713869919.pdfIn PDF document text
    • https://dutubigibud.files.wordpress.com/2020/05/soramasisijesi.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 1

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_off0000588c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x588C 11436 bytes
SHA-256: 2bfb9aae8fe46223899b65eb2b92549880c03b5b6f3334dd4fa9905228d9cc9f

Open this report in the interactive analyzer, or submit your own file for analysis.