Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf137c1e1550c487…

MALICIOUS

PDF

46.4 KB Created: 2020-03-25 08:22:16 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: 5d92d795a2919ca25726fa096e07ff50 SHA-1: b4969f93590e907be9117cfe1376e29679e9787c SHA-256: bf137c1e1550c487206df4c940ca133a7b5be50338dd3b1daedfb9d5b4203b87
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various PDF files hosted on different domains, suggesting a link farm or distribution mechanism. The document body contains metadata and what appears to be garbled text, but the primary malicious activity is the mass of embedded URLs. 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://humannaturefoundation.com/uploads/1/3/0/3/130323600/130323600.html#maurice+em+forster+movie PDF link annotation
    • http://ibericabb.com/uploads/1/3/0/5/130542859/8a8931ab2a4e0dd.pdfIn PDF document text
    • http://kertzmanracing.com/uploads/1/3/0/6/130604788/1421183.pdfIn PDF document text
    • http://drunkdrivinglegalaid.com/uploads/1/3/0/6/130621142/2228660.pdfIn PDF document text
    • http://myecwc.com/uploads/1/3/0/5/130588658/bbd4d.pdfIn PDF document text
    • http://mta-sts.normantonmetalspinners.co.uk/uploads/1/3/0/7/130739789/6870372.pdfIn PDF document text
    • http://www.rickydemedeiros.com/uploads/1/3/0/4/130478819/7120080.pdfIn PDF document text
    • http://messyjessyk9boardingllc.com/uploads/1/3/0/7/130776078/vizaj.pdfIn PDF document text
    • http://www.impressionistlandscaping.com/uploads/1/3/0/4/130483279/666247.pdfIn PDF document text
    • http://robynandwill.com/uploads/1/3/0/6/130620265/c4fb3e20064c.pdfIn PDF document text
    • http://absolutepediatrics.org/uploads/1/3/0/6/130604740/nibumik-wuxabejiwujon-vimonel.pdfIn PDF document text
    • http://phyachtcharter.com/uploads/1/3/0/5/130590357/porivetakuril-popenelidekomi.pdfIn PDF document text
    • http://peopleoptimised.com/uploads/1/3/0/9/130969842/e8c148c5634803.pdfIn PDF document text
    • http://fitnessbunny7.com/uploads/1/3/0/5/130543272/savakusubibez.pdfIn PDF document text
    • http://brightwhiteexpress.com/uploads/1/3/0/7/130739072/tusalike.pdfIn PDF document text
    • http://fireandiceservice.com/uploads/1/3/0/5/130543207/9575956.pdfIn PDF document text
    • http://rodencratersite.com/uploads/1/3/0/2/130271038/7102122.pdfIn PDF document text
    • http://mta-sts.mx.chaletbruant.com/uploads/1/3/1/1/131164520/8648598.pdfIn PDF document text
    • http://alfordtech.com/uploads/1/3/0/7/130775823/nubojolikebuxe.pdfIn PDF document text
    • http://www.canpump.net/uploads/1/3/0/7/130776591/64090dfd.pdfIn PDF document text
    • http://marykaysellsmilitary.com/uploads/1/3/0/9/130969237/2336687.pdfIn PDF document text
    • http://snazzyshaz.com/uploads/1/3/0/2/130272372/separigifaleni.pdfIn PDF document text
    • http://emersoncurtisbradford.com/uploads/1/3/0/7/130775665/47656c95.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 1

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7660 8508 bytes
SHA-256: 65b45aaba64ad216c8ff4165c490192f575b065ac508f9b3d274d1a78e3fd0d3
font_01_sfnt_off000096f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x96F5 16036 bytes
SHA-256: 779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63

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