Malicious PDF — malware analysis report

Static analysis result for SHA-256 f81ce8c29bf8cff9…

MALICIOUS

PDF

34.7 KB Created: 2020-05-09 23:32:02 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c7340a54bd8588e1c84d390488d9e3dd SHA-1: 49d6b53cfa9453e627e2b8a6b616daa6b9b1e446 SHA-256: f81ce8c29bf8cff9c8cf541f8da2755d4d49e237466d13eead245abedcacddb4
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicates maliciousness. The embedded URLs point to various domains, many of which appear to be part of a coordinated link farm. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://allsubzi.com/uploads/1/3/1/4/131406444/131406444.html#android+phone+3000+to+4000
    • http://crossfiteasternshore.com/uploads/1/3/1/4/131437750/b8e74.pdf
    • http://ofuapolicebrutality.org/uploads/1/3/1/4/131437667/2807547.pdf
    • http://straightundergroundartists.com/uploads/1/3/0/6/130621462/4481092.pdf
    • http://thehandstands.com/uploads/1/3/0/5/130550805/xogodixufoje.pdf
    • http://careercabinetsandclosets.com/uploads/1/3/0/6/130604602/mojegopi_redefan_jupiputizup_zexelidukikox.pdf
    • http://asli.industries/uploads/1/3/0/7/130739740/fizuvupesaris_zupul.pdf
    • http://nyespor.net/uploads/1/3/0/7/130738710/xekutigupevodavov.pdf
    • http://divachicboutique.org/uploads/1/3/0/7/130740210/7031234.pdf
    • http://mrefael.design/uploads/1/3/0/6/130639256/jopamovupajoga-judulaxufiko-nonero-rubodowikadusa.pdf
    • http://thecuteboss.com/uploads/1/3/0/6/130621455/giluvanezufezevur.pdf
    • http://deliciousnessinyourmouth.net/uploads/1/3/1/4/131407398/gosujimij.pdf
    • http://southernindianafolkschool.com/uploads/1/3/0/2/130289158/7535598.pdf
    • http://shubert-ticketing-services.com/uploads/1/3/0/6/130621610/vefugexa-guvizexijik-butezejidef.pdf
    • http://northernlightselectric.org/uploads/1/3/0/6/130604230/kusax-mupiso-kologigega-lisuler.pdf
    • http://intuitivecoaching.ca/uploads/1/3/1/4/131483423/jiworijerefu-zames-tigum.pdf
    • http://lfgflorida.com/uploads/1/3/0/5/130543289/e0b00.pdf
    • http://qb-makeup.com/uploads/1/3/0/7/130775542/koxep_gorulumifomupiz_gimupovunovut.pdf
    • http://sarahcorbett.org/uploads/1/3/0/7/130739198/cf4ef830.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • 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_off00005d84.bin
c6064158ce919bc00b726f22ebb00a0c427fbecb5a01d7ca06fccd50a1b8a11f
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D84 10316 bytes