Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e57ddd4fb5d3ec9…

MALICIOUS

PDF

45.2 KB Created: 2020-04-02 02:00:30 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 3486639d1cb5280f045ed1366859132b SHA-1: 2e1eaea047a28c26b1cfaa46978af91d580d1d55 SHA-256: 5e57ddd4fb5d3ec94eb4e846277039a44ef64810dd7e7f7b4f83fb30387fefa5
96 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, identified by the 'PDF_SEO_LINK_FARM' heuristic. The embedded URLs point to various domains, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly indicated maliciousness. The document body text, while containing garbled data, includes references to PDF and wkhtmltopdf, indicating its likely purpose is to host or link to external PDF content.

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://delamema.com/uploads/1/3/0/2/130288818/130288818.html#estructura+de+la+hemoglobina+pdf
    • http://picksupsticks.com/uploads/1/3/1/0/131070678/funavuguti-jodewuge-xadot-betelaverasiru.pdf
    • http://ksptree.com/uploads/1/3/0/3/130323406/d639f59224b3.pdf
    • http://sethspartanempire.com/uploads/1/3/0/8/130874278/210143.pdf
    • http://zimfarmbutchery.com/uploads/1/3/0/4/130436415/ruleb-burularedokuj-gubuvefibo-tamizepudud.pdf
    • http://papercraziness.com/uploads/1/3/0/9/130969082/zimaroraru.pdf
    • http://nunyabeeswax.net/uploads/1/3/0/6/130621486/faguwaregesiv_popegog.pdf
    • http://compositesovermolding.com/uploads/1/3/0/8/130813782/3290233.pdf
    • http://customcakesbykate.com/uploads/1/3/0/4/130483625/6248731.pdf
    • http://luqconsulting.com/uploads/1/3/0/7/130738859/303422.pdf
    • http://chloedaniellewhite.com/uploads/1/3/1/0/131069879/suwijada.pdf
    • http://laurascleaningservice.net/uploads/1/3/0/6/130639342/8745423.pdf
    • http://stephensonrefrigeration.com/uploads/1/3/0/6/130620624/jiruweg.pdf
    • http://avoid1800stranger.net/uploads/1/3/0/3/130313363/tuwoferesifiba.pdf
    • http://savinggraceacademy.org/uploads/1/3/0/6/130604421/bawim.pdf
    • http://aicfred.org/uploads/1/3/0/4/130476039/gudakugevu.pdf
    • http://cloudsign.solutions/uploads/1/3/1/4/131406295/mubivava-gifabidewumose.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000076c2.bin
ddc2bc103f75dc656fd9e992fbdc924e44cb98c0461ba92ce75e5f1d6638df2f
pdf-font-stream PDF embedded font (sfnt) at offset 0x76C2 9080 bytes
font_01_sfnt_off0000978c.bin
0ff28437254d4d3465b41c8c6f2813db8f4c738a4b49e457dc545ef1554654f9
pdf-font-stream PDF embedded font (sfnt) at offset 0x978C 4096 bytes