Malicious PDF — malware analysis report

Static analysis result for SHA-256 537b523d02f787da…

MALICIOUS

PDF

37.7 KB Created: 2020-03-25 08:51:42 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: 81b99bd173b93237d3f11bf02642e0bf SHA-1: 30c71934a6a05ca0a9316d3424edad1e7b756849 SHA-256: 537b523d02f787da4cccf8dfc7c54589024dab63fb5ce8aa01142fa46fca8093
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 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 various domains, suggesting a link farm or SEO manipulation tactic. The document body contains garbled text and references to 'wkhtmltopdf', indicating it was likely generated programmatically. The primary intent appears to be directing users to these external sites, which could host malicious content or phishing pages.

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://humannaturefoundation.com/uploads/1/3/0/8/130813790/130813790.html#korg+triton+prox+88+specs PDF link annotation
    • http://robot-detective.com/uploads/1/3/0/5/130550750/3330775.pdfIn PDF document text
    • http://karinamadrigal.com/uploads/1/3/0/6/130639852/padigolenelu-retor-gegonowepim.pdfIn PDF document text
    • http://northernyoga.ca/uploads/1/3/0/6/130620601/f4ae2a8cbe0bdca.pdfIn PDF document text
    • http://www.nourishingpacificnw.com/uploads/1/3/0/9/130969176/nerarigemikopijaduwa.pdfIn PDF document text
    • http://www.shockbuilder.com/uploads/1/3/1/0/131070171/f8f07349.pdfIn PDF document text
    • http://littledoveconsultants.com/uploads/1/3/0/6/130604642/3764388.pdfIn PDF document text
    • http://daanvanirsel.com/uploads/1/3/0/3/130313572/5637555.pdfIn PDF document text
    • http://wsgwt.com/uploads/1/3/0/7/130775279/bixavodilejegi_wukor_roninelebizaz.pdfIn PDF document text
    • http://justforyouspa.com/uploads/1/3/0/6/130639038/lajekora-dujema.pdfIn PDF document text
    • http://www.lienphotography.com/uploads/1/3/0/6/130620902/fixojixav.pdfIn PDF document text
    • http://melodymurphyphotos.com/uploads/1/3/0/9/130969477/gupejudekogasi-dixonesilu-kijanirono.pdfIn PDF document text
    • http://revkillanc.com/uploads/1/3/0/9/130969372/6675942.pdfIn PDF document text
    • http://laurenvanmullem.com/uploads/1/3/0/4/130436127/a1ba15b9.pdfIn PDF document text
    • http://shawnakirby.com/uploads/1/3/0/6/130621333/6516925.pdfIn PDF document text
    • http://mta-sts.mx.omgp.org/uploads/1/3/0/6/130639510/101a21b5ce8d.pdfIn PDF document text
    • http://seannxenja.com/uploads/1/3/0/6/130605178/9038441.pdfIn PDF document text
    • http://www.lionsdenergy.com/uploads/1/3/0/4/130489363/levemozosojuw.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 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_off00006cb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CB8 7352 bytes
SHA-256: 2aeba32a2a3b411c88f83d42a899382fa57affa46d8d772a6caa307eab859a14

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