Malicious PDF — malware analysis report

Static analysis result for SHA-256 31b5c38b44c13d73…

MALICIOUS

PDF

48.9 KB Created: 2020-04-01 17:54:24 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-15
MD5: fefbf1a17744fe414db79255b9ce8d10 SHA-1: 610e6a466adc81432b49cdc68e229392bcbd625b SHA-256: 31b5c38b44c13d7387920631e0671431a01f31abf886549a4c1e965d7b3f802c
96 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, suggesting a link farm or redirection scheme. The primary purpose appears to be directing users to these external resources, potentially for SEO manipulation or to host further malicious content. 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://absolutedimensioninc.com/uploads/1/3/1/4/131455463/131455463.html#energia+de+mares+y+oceanos PDF link annotation
    • http://amor-mundi.org/uploads/1/3/0/6/130604176/4898900.pdfIn PDF document text
    • http://fancyfishupcycling.com/uploads/1/3/0/8/130874175/1da62.pdfIn PDF document text
    • http://troop104madison.org/uploads/1/3/0/6/130639438/6258238.pdfIn PDF document text
    • http://reikiforalternativehealing.com/uploads/1/3/0/6/130603772/adaf32f56a79e.pdfIn PDF document text
    • http://vancouverislandsafari.com/uploads/1/3/0/7/130776072/cd4721ac99e0f47.pdfIn PDF document text
    • http://modehealthandfitness.com/uploads/1/3/0/2/130272387/neletel.pdfIn PDF document text
    • http://lacysphotos.com/uploads/1/3/0/7/130739682/8564091.pdfIn PDF document text
    • http://commercialcompliance.com/uploads/1/3/0/6/130604112/ketojowawu_jowevudazedin_xozolozufugaje.pdfIn PDF document text
    • http://bpreparednow.com/uploads/1/3/1/0/131070487/begetopexuf_fadimewezazo_vatesazu_zozoderin.pdfIn PDF document text
    • http://countrycousinssp.com/uploads/1/3/0/6/130621134/jamuxizowi.pdfIn PDF document text
    • http://environmoment.com/uploads/1/3/0/6/130621908/07b5206ebcce.pdfIn PDF document text
    • http://laserartistryfasa.net/uploads/1/3/0/3/130324137/3772991.pdfIn PDF document text
    • http://sffclions.org/uploads/1/3/1/3/131397989/5443797.pdfIn PDF document text
    • http://rosecityhealth.com/uploads/1/3/0/8/130814042/391e10148a.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7372 10388 bytes
SHA-256: a57755bc34c0399fd7d0a8e1d22f84ff68b7b95c9830ca14f2a3f62ec5501651
font_01_sfnt_off00009616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9616 2652 bytes
SHA-256: e91619dfd4c72a85464d95ef1ba4e67df13020651c42071bafbe521a61d9f7fc
font_02_sfnt_off00009f7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9F7D 16036 bytes
SHA-256: 779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63

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