Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e339e7fdd4948a0…

MALICIOUS

PDF

31.9 KB Created: 2020-06-06 04:12:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e56ab269bd49d80651f2282818bb7918 SHA-1: fc90ff6845e87080a205892c92b9165e7a4dfcf3 SHA-256: 1e339e7fdd4948a01fb1fbfe6290e1b99167c16951cb8bf7721cc94c12dff407
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also flagged this PDF as malicious with high confidence. The embedded URLs suggest a link farm or SEO manipulation tactic, potentially used to distribute further malicious content or to improve search engine rankings for malicious sites. 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://host129.carmichaelnl.com/uploads/1/3/1/1/131163693/131163693.html#principles+of+economics+8th+edition
    • http://allytradegroup.com/uploads/1/3/0/5/130588546/goxefav-lexisipurap-rawonesarot.pdf
    • http://ntlamattress.com/uploads/1/3/0/5/130539849/kuwas.pdf
    • http://clientelefinder.com/uploads/1/3/0/8/130874672/2883395.pdf
    • http://ericvayle.com/uploads/1/3/0/4/130435927/bufexazuze_jopijutapibirux.pdf
    • http://emmaatterbury.com/uploads/1/3/0/7/130739379/turumo-vatolajeraxel-barobopoman-vatuwuxaxufu.pdf
    • http://jaxpropertyinspections.com/uploads/1/3/0/7/130739552/cde6c2.pdf
    • http://mail.lullabylinks.com/uploads/1/3/0/7/130775587/maxenapi.pdf
    • http://cribtalks.com/uploads/1/3/0/4/130494389/kagurosikiv_ninibizejagalim.pdf
    • http://grupojaziel.com/uploads/1/3/0/6/130605420/77eff.pdf
    • http://host129.carmichaelnl.com/uploads/1/3/1/1/131163693/terms.html
    • http://host129.carmichaelnl.com/uploads/1/3/1/1/131163693/dmca.html
    • http://host129.carmichaelnl.com/uploads/1/3/1/1/131163693/policy.html
    • https://banudusi.files.wordpress.com/2020/06/sosikoposines.pdf
    • https://susobagiv.files.wordpress.com/2020/06/48043116906.pdf
    • https://tibozetus.files.wordpress.com/2020/06/bunawikawug.pdf
    • https://malejigide.files.wordpress.com/2020/06/sixorafoduluvemuxoro.pdf
    • https://tuvakula406676748.files.wordpress.com/2020/06/tetezodumokag.pdf
    • https://vutezumeg.files.wordpress.com/2020/06/2873022568.pdf
    • https://vajepevugu.files.wordpress.com/2020/06/putiw.pdf
    • https://dusebuxe.files.wordpress.com/2020/06/lometukapafowovojaduroduv.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_off000051b8.bin
c1abbe5ef343444388feec7e0fa06b6f87f4c350fda7a93779008794e42db11e
pdf-font-stream PDF embedded font (sfnt) at offset 0x51B8 9820 bytes