Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f5070b7f847dfb8…

MALICIOUS

PDF

34.4 KB Created: 2020-04-10 15:18:19 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d671f2363c81171371f48482102a5ae5 SHA-1: 74b506b8a2e0bd449f6085f5d240587f19024594 SHA-256: 5f5070b7f847dfb85ad2c3737623011f020c0ce3b39afd41719913f9c4016579
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier strongly flagged this PDF as malicious. The embedded links, such as http://peakathleticsystems.com/uploads/1/3/1/4/131483083/131483083.html#singer+9410+service+manual, suggest a tactic to drive traffic to potentially malicious sites or for SEO manipulation. No scripts were extracted, but the sheer volume of links points to a coordinated effort to redirect users.

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://peakathleticsystems.com/uploads/1/3/1/4/131483083/131483083.html#singer+9410+service+manual
    • http://buckowskinguyen.com/uploads/1/3/1/4/131409693/dalosuga-natole-fibajofiwi-mawirexuvumop.pdf
    • http://sunclubworldwide.com/uploads/1/3/0/4/130488616/4664752.pdf
    • http://ilsassonelpozzo.it/uploads/1/3/0/3/130313612/4346259.pdf
    • http://masfitnessproducts.com/uploads/1/3/0/3/130324386/a9ff83283.pdf
    • http://myarkcenter.com/uploads/1/3/1/1/131163691/nivejakaw.pdf
    • http://lrstransport.net/uploads/1/3/0/2/130289320/lenesuwejufal.pdf
    • http://roboticcampnc.com/uploads/1/3/1/3/131380521/wisutiboliro_wivupelalapew.pdf
    • http://expresshomeinspectors.net/uploads/1/3/0/5/130588551/legowuzemerufon.pdf
    • http://meetusatthegrove.org/uploads/1/3/0/5/130589227/novimokepiwatipezixe.pdf
    • http://gadia.info/uploads/1/3/0/5/130548152/xuluzawubokugasupul.pdf
    • http://4jsnvr.com/uploads/1/3/0/7/130775782/93e8afa6d873a.pdf
    • http://feckspellchuck.com/uploads/1/3/1/4/131482993/dezesikara.pdf
    • http://kidscodesiliconvalley.com/uploads/1/3/0/2/130274322/bupufulod.pdf
    • http://winkcapsulehostel.com/uploads/1/3/0/6/130603889/55dd93197a44ea.pdf
    • http://itdtechnologie.fr/uploads/1/3/0/5/130590592/6c4757206e5.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_off00005cfb.bin
26d27006acef1707f25f31d323f79018be585c34d1821b436f0d3fcfac46eee6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CFB 8212 bytes

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