Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b0e8b17c8a525cb…

MALICIOUS

PDF

39.9 KB Created: 2020-04-12 16:29:33 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f1d171c49a3729b639be302f29dfa9b4 SHA-1: 2b63ec45ce521ce791511979076021bafc5c7635 SHA-256: 1b0e8b17c8a525cb17ea78378273492c4c6c5f886346479600743fb126057842
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDF files on various domains, indicative of a link farm or SEO spam operation. The ML classifier strongly flagged this PDF as malicious. The document body text, though partially corrupted, suggests a lure related to the 'history and origin of corn'. No scripts were extracted from this sample.

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/1/3/0/5/130540049/130540049.html#historia+y+origen+del+maiz+pdf
    • http://hair-connection-llc.com/uploads/1/3/0/6/130640200/2b9ce80.pdf
    • http://haircascades.com/uploads/1/3/0/4/130483924/3315939.pdf
    • http://digitaldealermarketingsolutions.com/uploads/1/3/0/2/130272086/fugenimutugirevabidu.pdf
    • http://blackhillsbirthbootcamp.com/uploads/1/3/0/7/130738781/a9e92b7a0c.pdf
    • http://expertpeintureindustrielle.net/uploads/1/3/0/9/130968985/2108106.pdf
    • http://youclaimit.net/uploads/1/3/1/0/131070255/puzijinupa-tuvizawikug-nedaka-dosijep.pdf
    • http://maxsmoviecreater.com/uploads/1/3/0/5/130539315/6632212.pdf
    • http://visionsusa.org/uploads/1/3/0/4/130435511/5261433.pdf
    • http://surfnrelax.com/uploads/1/3/0/6/130604806/8772864.pdf
    • http://photo-mex.com/uploads/1/3/0/8/130874129/tapadewezuxofugodu.pdf
    • http://thebesticecreamandcoffeesolvang.com/uploads/1/3/0/9/130969469/difikoninupani.pdf
    • http://michaelfranklambert.com/uploads/1/3/1/4/131438658/xuwagegokosafi-mokimekotazobi-jomokabob.pdf
    • http://vivalcohomes.com/uploads/1/3/0/4/130436285/lofenusepixa-fabikiwon-tovulan-kotezufuxaduma.pdf
    • http://lmservices.org/uploads/1/3/1/4/131482833/mebur-jiketok.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_off0000709f.bin
39200488fd4823cd85ab8ffa881f2f0e9082021db3bf5595dda2e9238b911c0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x709F 9256 bytes

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