Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4d461b1972603ee…

MALICIOUS

PDF

33.6 KB Created: 2020-03-27 01:57:30 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: a08b33858b26f1ef7633277591b61b85 SHA-1: 2fdfb849b53b9cf99893e981f4bc506cf0e3f541 SHA-256: c4d461b1972603ee4770f2a8c025996b6fde469549b70b3d1a965bcf47854d42
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are part of this link farm, suggesting a coordinated effort to direct users to potentially malicious content or for SEO manipulation. 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://hplministries.org/uploads/1/3/1/4/131407028/131407028.html#schwinn+baby+bike+seat+manual PDF link annotation
    • http://rapid-fire-dashboards.com/uploads/1/3/0/3/130324030/424476.pdfIn PDF document text
    • http://www.opsnav.com/uploads/1/3/0/5/130542822/terap_josatuvomukon.pdfIn PDF document text
    • http://plentyoffishcall-updates.com/uploads/1/3/0/5/130589397/5826683.pdfIn PDF document text
    • http://littlepoppitsphotography.com/uploads/1/3/0/5/130541000/3317736.pdfIn PDF document text
    • http://emersoncurtisbradford.com/uploads/1/3/0/4/130476075/9dfb8.pdfIn PDF document text
    • http://withthisringsocal.com/uploads/1/3/0/2/130289502/2703733.pdfIn PDF document text
    • http://thesisterlashes.com/uploads/1/3/0/4/130489410/730175.pdfIn PDF document text
    • http://www.standrewsssocietyofseoul.com/uploads/1/3/0/6/130639845/bf8445.pdfIn PDF document text
    • http://reddeermassages.ca/uploads/1/3/0/7/130738503/60346c4b8871d.pdfIn PDF document text
    • http://zupine.com/uploads/1/3/0/3/130313429/d49191e198254df.pdfIn PDF document text
    • http://nabilaq.com/uploads/1/3/0/4/130476180/4067023.pdfIn PDF document text
    • http://cubbiesmakemehappy.com/uploads/1/3/0/7/130775111/gapozubavaz.pdfIn PDF document text
    • http://kolbe-press.com/uploads/1/3/0/7/130739280/5857498.pdfIn PDF document text
    • http://espinalconsultores.com/uploads/1/3/0/9/130969712/fisofike.pdfIn PDF document text
    • http://zendreaming.com/uploads/1/3/0/5/130551386/zuwakulukugota-retute-giruxekej.pdfIn PDF document text
    • http://viajeszafra.es/uploads/1/3/1/0/131070488/ed34030589.pdfIn PDF document text
    • http://nutritionwithnahla.net/uploads/1/3/0/5/130541000/187989.pdfIn PDF document text
    • http://aprenderaintuir.com/uploads/1/3/0/6/130621060/3754330.pdfIn PDF document text
    • http://smithstudio.ca/uploads/1/3/0/9/130969037/vovafinewutog_pukusivew.pdfIn PDF document text
    • http://hostmaster.verbrassen.nl/uploads/1/3/0/4/130435685/2900205.pdfIn PDF document text
    • http://www.carterart.org/uploads/1/3/0/6/130620796/2432366.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

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_off00005ae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5AE1 7672 bytes
SHA-256: db7a4f65f2a6fd6a9622072976054a29005cefa2d0f41c7bd44fc802f79bc566

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