Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b272e326afd1906…

MALICIOUS

PDF

45.8 KB Created: 2020-03-31 07:48:10 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ffc4f57de766178de7fa3c82a19026ce SHA-1: cb85123a03ffc6f1f06e525dcd21aec3759f72be SHA-256: 5b272e326afd1906cb740d5abffbe60bc837421bc63579d012bbf884209289a1
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 an attempt to manipulate search engine results or redirect users to potentially malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the sheer volume of external links is highly suspicious.

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://pagessupersuds.com/uploads/1/3/0/4/130488244/130488244.html#trabajos+manuales+con+papel+para+ni%C3%B1os+de+primaria
    • http://ajakchinger.com/uploads/1/3/0/8/130874403/76986e4d.pdf
    • http://lolitasattic.com/uploads/1/3/0/5/130588856/9603364.pdf
    • http://vanessasicaart.ca/uploads/1/3/0/5/130589429/feninasebagukev_kurupimumomo.pdf
    • http://teitsson.com/uploads/1/3/0/9/130969931/6881818.pdf
    • http://foundmywow.com/uploads/1/3/0/4/130435711/zojikar-pinovu-mudokarili.pdf
    • http://crownway.org/uploads/1/3/0/2/130287960/5bd96.pdf
    • http://practicalherbology.com/uploads/1/3/1/1/131163992/lixawegununu_dipumopar.pdf
    • http://boomerangpilatesandwellness.com/uploads/1/3/0/5/130551001/b1664a63fef4.pdf
    • http://arsfabricandi.com/uploads/1/3/1/1/131163828/3424353.pdf
    • http://metaphorboutique.com/uploads/1/3/0/7/130775958/5751310.pdf
    • http://floridawaterlife.com/uploads/1/3/0/6/130621043/3769443.pdf
    • http://ghsoluciones.net/uploads/1/3/0/6/130621006/8812609.pdf
    • http://stella-michaels.com/uploads/1/3/0/3/130313610/9096065.pdf
    • http://thirddraftlife.com/uploads/1/3/0/4/130476066/7258d6af6f.pdf
    • http://mawg.design/uploads/1/3/0/7/130776415/lubudolonoziwaba.pdf
    • http://dukeshillstud.com/uploads/1/3/0/5/130588463/zujepidozusat-xifudenefu-govolososipakup.pdf
    • http://lemoulinprive.com/uploads/1/3/0/2/130287915/048e7.pdf
    • http://shop2ndtime.com/uploads/1/3/0/8/130814179/zetotimiruful-katuwobatapug-ruzijaludez-zuwekew.pdf
    • http://pestcontrolflagler.com/uploads/1/3/0/6/130639616/31f2bf403e022.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/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007285.bin
5b03f99a7db230248003e502eae3ef60c6b2ceb472b5b0eb89504c3297789d5b
pdf-font-stream PDF embedded font (sfnt) at offset 0x7285 8652 bytes
font_01_sfnt_off000091f7.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63
pdf-font-stream PDF embedded font (sfnt) at offset 0x91F7 16036 bytes