Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a8613383034774d…

MALICIOUS

PDF

37.0 KB Created: 2020-05-17 21:02:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 37babe403cf398cbbe0caf99aeee80f3 SHA-1: a51524ced370ea781e8a5e6b6e5c354f29c59083 SHA-256: 4a8613383034774d9f40243171b1771ad4bf6a3c74f8abe5a8e1f5eec8928d03
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to numerous other PDF files hosted across various domains, suggesting a link farm or content distribution network. The ML classifier also strongly indicated maliciousness. The primary purpose appears to be directing users to a wide array of external resources, potentially for SEO manipulation or to serve as a distribution point for further malicious payloads.

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://christinabeautyparlour.com/uploads/1/3/1/4/131407742/131407742.html#cell+respiration+quiz+pdf PDF link annotation
    • http://enterprisegaming.news/uploads/1/3/0/4/130436017/8b33d9449a07e90.pdfIn PDF document text
    • http://highschoolenglishonline.com/uploads/1/3/0/8/130814976/14644ccc0.pdfIn PDF document text
    • http://weaverpaving.com/uploads/1/3/0/8/130874666/sujuzanek_bizerufokin_totopagipibome.pdfIn PDF document text
    • http://feralweaver.com/uploads/1/3/0/4/130476270/xivisaw.pdfIn PDF document text
    • http://bluediamondfarms.com/uploads/1/3/0/5/130539944/beponadifobude.pdfIn PDF document text
    • http://pncsportsconsulting.com/uploads/1/3/0/6/130605248/7f60d.pdfIn PDF document text
    • http://universitysuccessformula.com/uploads/1/3/0/5/130589399/jopigufugodas.pdfIn PDF document text
    • http://betterbrainscience.com/uploads/1/3/0/5/130544138/nixiz_nedule_sasebon.pdfIn PDF document text
    • http://testify.se/uploads/1/3/1/1/131163917/2695591.pdfIn PDF document text
    • http://dondecomprarsoat.com/uploads/1/3/0/5/130542728/xixenaj_bapevi_galarube.pdfIn PDF document text
    • http://homerunpress.nyc/uploads/1/3/0/9/130969939/37d730.pdfIn PDF document text
    • http://s4like.net/uploads/1/3/0/8/130814219/3618428.pdfIn PDF document text
    • http://munhutudermatology.com/uploads/1/3/0/6/130605516/kudegevoxejid_jefodipi_tusavi.pdfIn PDF document text
    • http://catercreate.com/uploads/1/3/0/7/130776519/91994.pdfIn PDF document text
    • http://consciousmiracles.com/uploads/1/3/0/3/130323375/wadaxodowagotalajip.pdfIn PDF document text
    • http://makemoremoney2019.club/uploads/1/3/0/4/130489351/4231757.pdfIn PDF document text
    • http://idreamof.jewelry/uploads/1/3/1/0/131071240/kizobe.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
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 2

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_off000064a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64A0 10552 bytes
SHA-256: c3c788d62ec0ca4f09dae45aa86a8dc372357af4bec70d690b70cff7b4c51eb9

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