Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c785b59abfe6cfe…

MALICIOUS

PDF

56.0 KB Created: 2020-04-01 22:37:16 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 80e7fa51eab82e608f3c5522dd6e210f SHA-1: 558b48aebbe70ec98b766a0a84159a67b5b41142 SHA-256: 0c785b59abfe6cfee729a4b20625dbcd8cfb0a2a5b05d4a9cd85363914132977
104 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links to external PDF files, indicative of a link farm or SEO poisoning tactic. One prominent link, 'http://socialstudiesforthefuture.com/uploads/1/3/0/5/130590336/130590336.html#sister+souljah+coldest+winter+ever+free+download', suggests a lure for free content. The ML classifier strongly flagged this PDF as malicious, and the presence of a mass external link farm further supports a malicious intent, likely to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://socialstudiesforthefuture.com/uploads/1/3/0/5/130590336/130590336.html#sister+souljah+coldest+winter+ever+free+download
    • http://belleajai.com/uploads/1/3/0/9/130969747/pufof-dosef-ferefuro.pdf
    • http://statusnovi.org/uploads/1/3/0/2/130272234/4f60781.pdf
    • http://wnmconstruction.net/uploads/1/3/0/4/130435737/muwuj-defovisilo-dalarof.pdf
    • http://ashlihurt.com/uploads/1/3/0/8/130814200/fizolebanidukixi.pdf
    • http://alexandrafloralevents.com/uploads/1/3/0/6/130621135/jumaba.pdf
    • http://parkista.com/uploads/1/3/0/2/130289474/jamipokumemote.pdf
    • http://mjhomebuilders.com/uploads/1/3/0/4/130490056/vixuvigefedexuxu.pdf
    • http://redshiftbrewery.com/uploads/1/3/0/9/130969725/ccb4558a8f9a.pdf
    • http://theartistandthekabbalist.com/uploads/1/3/0/7/130738696/zikibazedabina.pdf
    • http://jfmarbleandgranite.com/uploads/1/3/0/2/130272619/xugelu-penari-lisekigifilo.pdf
    • http://hendricksmcfarlane.com/uploads/1/3/0/5/130543050/862656.pdf
    • http://georgiafrontrunners.com/uploads/1/3/0/5/130589158/b15f74269f.pdf
    • http://bizania.org/uploads/1/3/0/9/130969571/jolawajate.pdf
    • http://thewordaccordingtotushi.com/uploads/1/3/0/2/130271143/bemisaxemujadegi.pdf
    • http://deewanekhaas.net/uploads/1/3/0/5/130540767/9cb756391.pdf
    • http://handmadefashion.us/uploads/1/3/0/8/130814553/gamap_lewuvilabujo_redivuledem_givaw.pdf
    • http://theridgeburkecountyga.com/uploads/1/3/0/2/130287296/8938643.pdf
    • http://handmadeky.com/uploads/1/3/0/5/130545278/8145423.pdf
    • http://aranovus.co.nz/uploads/1/3/0/4/130436147/xigikodi.pdf
    • http://magicboxpost.com/uploads/1/3/0/6/130621444/biwavewuxit.pdf
    • http://groundservicesllc.com/uploads/1/3/0/7/130740232/1995013.pdf
    • http://nycartsed.com/uploads/1/3/0/7/130776819/tixuk.pdf
    • http://etudesdeza.com/uploads/1/3/0/5/130541677/juzulimidar_retofe_wowisoras.pdf
    • http://restcounselling.com/uploads/1/3/1/4/131409244/womezigomofipow.pdf
    • http://westhoffbrothersconstruction.com/uploads/1/3/0/6/130621393/zevejixejo.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_off0000aaaa.bin
26bae77e143bab64073a02f177acbf5b4b9a6737dda56b7e707d52610c73b972
pdf-font-stream PDF embedded font (sfnt) at offset 0xAAAA 9772 bytes