Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bfbc6f5d4aae740…

MALICIOUS

PDF

38.9 KB Created: 2020-06-07 14:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a2828665df49462b5397f1240e77649 SHA-1: 2f476062af62458a01bde6dbf08c4ad1f22baff2 SHA-256: 8bfbc6f5d4aae740ddb9006356d53e44ceb73d4d2858cbcdfd1cde6046162c3b
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to domains that appear to be part of a link farm designed to host malicious content. The ML classifier strongly indicated maliciousness. The document body, though partially corrupted, contains a reference to 'Julsänger av taylor swift' and includes several URLs, suggesting a lure to external, potentially malicious, websites.

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://njliupdate.com/uploads/1/3/1/4/131412426/131412426.html#juls%25C3%25A5nger+av+taylor+swift
    • http://tradiscs.com/uploads/1/3/1/8/131856487/roperakira_remenu_wujafuzij_xikuso.pdf
    • http://starsforabettertomorrow.org/uploads/1/3/1/4/131454850/8374864.pdf
    • http://brandverletzt.de/uploads/1/3/0/7/130739032/lujapibukis-bexafawibil.pdf
    • http://expressgraphxinc.com/uploads/1/3/1/4/131454057/0e3e910fcd85f10.pdf
    • http://rjfrankeandco.com/uploads/1/3/0/7/130739002/904066.pdf
    • http://untamedappetites.com/uploads/1/3/1/4/131454762/wezikuguj-pupilumef-vatol.pdf
    • http://cascadeservice.org/uploads/1/3/0/6/130640092/pixunujikupobuxanev.pdf
    • http://carrickbbqcatering.com/uploads/1/3/0/6/130604294/gusoroneperufow_rojole_sejona_gigalunerelavit.pdf
    • http://thenaturalway.shop/uploads/1/3/0/5/130544889/wusaf.pdf
    • http://axisgrip.com/uploads/1/3/0/3/130379426/ff45247d.pdf
    • http://cortiselectrical.com/uploads/1/3/1/4/131483053/4671259.pdf
    • https://mokabax.files.wordpress.com/2020/06/29908840905.pdf
    • https://jifumulunubi.files.wordpress.com/2020/06/90460782.pdf
    • https://gezapatuf.files.wordpress.com/2020/06/xuwufesigunigevefuz.pdf
    • https://kawumafovod.files.wordpress.com/2020/06/49778001054.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_off00005eb5.bin
dc50cd23d535bbb43176fd4a59dcce0e5379c475ed87cfeee6f7263b8f483570		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EB5 21916 bytes

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