Malicious PDF — malware analysis report

Static analysis result for SHA-256 9426b3c0c1e66502…

MALICIOUS

PDF

37.9 KB Created: 2020-03-29 11:54:25 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 32d5a0a32b4ec4cade1e2545a779da02 SHA-1: 834206a12826dc9f93b752021ccf772071fa7a71 SHA-256: 9426b3c0c1e665027da6be9462409edac5ce5a07fe96e3de35f81a3e1a5b3288
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to similarly structured URLs on different domains. The document body, though partially corrupted, contains a lure related to changing a thermostat battery and references the wkhtmltopdf tool, suggesting it was generated programmatically. The PDF_SEO_LINK_FARM heuristic indicates a deliberate attempt to create a link farm, likely for SEO manipulation or to host malicious content. The ML classifier strongly flagged this PDF as malicious.

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://74-123-77-223.mgwnet.com/uploads/1/3/1/3/131380786/131380786.html#how+to+change+battery+on+a+honeywell+thermostat
    • http://fundacjawawer.org/uploads/1/3/0/7/130739012/7178029.pdf
    • http://everydaychristianity.org/uploads/1/3/0/6/130621841/nibod.pdf
    • http://ifcava.info/uploads/1/3/0/5/130589243/xokedixe.pdf
    • http://ravenbeakfarm.com/uploads/1/3/0/3/130323407/7621413.pdf
    • http://sixstreetsartstrail.co.uk/uploads/1/3/1/3/131380616/9988720.pdf
    • http://springsfbc.org/uploads/1/3/0/4/130483400/4057093.pdf
    • http://kelbels.org/uploads/1/3/0/8/130814279/tevozef.pdf
    • http://memoryamerica.net/uploads/1/3/0/4/130488914/311053.pdf
    • http://irarifkin.com/uploads/1/3/0/5/130551543/c1f8700e40c77.pdf
    • http://lmpparalegalservices.com/uploads/1/3/0/2/130270798/be54651fe2664.pdf
    • http://oregonizdlovingtoday.com/uploads/1/3/0/6/130620863/wutub_bevif_fopugigiwif_kuvimod.pdf
    • http://edmsm.com/uploads/1/3/1/1/131164077/lepojezabu_xovise_mewobulesus_kekuvuluvet.pdf
    • http://heatherweddings.com/uploads/1/3/0/2/130289458/3293276.pdf
    • http://loanpeople.net/uploads/1/3/0/7/130739449/lijimeg.pdf
    • http://cassandraperkins.info/uploads/1/3/0/2/130289339/e7c9b5.pdf
    • http://mscbmx.com/uploads/1/3/0/6/130620836/9717556.pdf
    • http://toykingdom.org/uploads/1/3/0/6/130639571/1587288.pdf
    • http://yyzpreview.com/uploads/1/3/0/2/130289670/tomodanawirobatujifu.pdf
    • http://asedonaweddingforyou.com/uploads/1/3/0/2/130272609/xuvubumurug_befitofavupebed_duxuvekamuru_zowejuwedolo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006bc9.bin
685171f52ab53f56ca6c954efeb0d126c22cb27ef8ea0f5910cb8c3e9f024686
pdf-font-stream PDF embedded font (sfnt) at offset 0x6BC9 7196 bytes