Malicious PDF — malware analysis report

Static analysis result for SHA-256 903d582316ef66f4…

MALICIOUS

PDF

38.5 KB Created: 2020-04-01 17:52:28 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ece009f106c93a3ec00aa4727b4ebb4d SHA-1: 2db48e8fcd550e075ab2e31cf677054e5b498e75 SHA-256: 903d582316ef66f4d5d69a658f4614444aea657071efe61911e637d4e4da0bf5
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links to other PDF files, a technique often used for SEO spam or to distribute malicious content. The ML classifier strongly indicated maliciousness. While no scripts were extracted, the sheer volume of outbound links suggests a malicious intent to redirect the user to potentially harmful content hosted on domains like bg4c.com and nocussboutique.com.

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://bg4c.com/uploads/1/3/0/6/130639873/130639873.html#conversion+de+hectogramo+a+kilogramos
    • http://nocussboutique.com/uploads/1/3/0/6/130622024/dasulasana-rupawolenimu-pivolovad.pdf
    • http://calderacounselling.com/uploads/1/3/1/0/131070246/4867271.pdf
    • http://orthosolution.net/uploads/1/3/0/6/130621435/dejemujo-vapajuwupuk.pdf
    • http://kerrycannon.com/uploads/1/3/0/5/130539728/burenupadete.pdf
    • http://brittenstrong.org/uploads/1/3/0/7/130775011/munidozegopaz_dusijuxo_ninazixosetil_nigipivawe.pdf
    • http://htoursi.com/uploads/1/3/0/3/130323477/fevemajuwefa_sudunowikadapo_gotoxur_fobeg.pdf
    • http://instituteofpulsedtherapy.com/uploads/1/3/0/7/130776790/tikiwuleveletevinev.pdf
    • http://pauldebruyne.eu/uploads/1/3/0/7/130776428/loziti-negevifigenexab-mabin.pdf
    • http://justchryssbeauty.com/uploads/1/3/0/4/130490444/relimedegofiwujurumi.pdf
    • http://sarahwhelchel.com/uploads/1/3/0/5/130539114/7d1b97bdb86331.pdf
    • http://mrsdsmithsthirdgrade.com/uploads/1/3/0/7/130775797/vomawikopovixes.pdf
    • http://proaqui.net/uploads/1/3/0/3/130379391/1597cb.pdf
    • http://folkartbyfaith.com/uploads/1/3/0/2/130291539/ximifowewinadogavo.pdf
    • http://avira-residence.ro/uploads/1/3/0/6/130621045/sadetizuxil_kuvawas_virabaxib_ramoretolid.pdf
    • http://camellahrsolutions.com/uploads/1/3/0/6/130621932/pixavi_zonomajaxobuzej_gerobo.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_off00006c00.bin
ceee5f51c94cd912d0ebda703517812c5cfc3034bfdacf00bad0eafae48f3fb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C00 8584 bytes

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