Malicious PDF — malware analysis report

Static analysis result for SHA-256 598218a39d8d27c6…

MALICIOUS

PDF

49.6 KB Created: 2020-03-31 09:11:08 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 091721aa0ce8f780ea5f30521a70f930 SHA-1: f517ddc8203b5f93d97084947c1ab768976c0470 SHA-256: 598218a39d8d27c67da1d3400d4fae1acfa9b41e24534d16f3d7e014bacd58a5
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The embedded document body text, while partially corrupted, contains references to URLs that are part of this link farm. The primary purpose appears to be directing users to a multitude of external sites, likely for SEO spam or to host further malicious content.

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://cookiecorner.org/uploads/1/3/0/5/130589036/130589036.html#propiedades+de+las+sustancias+ionicas+covalentes+y+metalicas
    • http://mightyscripture.net/uploads/1/3/0/7/130739897/9526025.pdf
    • http://sunnysideupslime.com/uploads/1/3/0/4/130493476/9680172.pdf
    • http://ssuvhsg.ch/uploads/1/3/0/3/130379074/45615e6daa305c.pdf
    • http://crosstransformationsllc.com/uploads/1/3/0/7/130740387/9320538.pdf
    • http://mail.orders.vimadathaikitchen.com/uploads/1/3/0/5/130551229/fetunevetu_moguku_janejorosib.pdf
    • http://sarahelizabethhurley.com/uploads/1/3/0/2/130288939/062449e.pdf
    • http://paradiseboundadventures.net/uploads/1/3/0/5/130590672/pikod.pdf
    • http://dariospainting.com/uploads/1/3/0/2/130270897/2971259.pdf
    • http://cardenschooltehachapi.org/uploads/1/3/0/5/130540619/5890885.pdf
    • http://shootingrobots.com/uploads/1/3/0/6/130620572/4405602.pdf
    • http://sofiaspiveyart.com/uploads/1/3/0/4/130483348/zubaxovamokenumipex.pdf
    • http://diamondsbet.com/uploads/1/3/0/2/130272360/bevisebogowat-ronobofaxeseg-miresimi-penupirego.pdf
    • http://therapielaurentides.com/uploads/1/3/0/5/130538875/ed117f.pdf
    • http://zackzairul.com/uploads/1/3/0/8/130814716/difadusisetete-faganekewam.pdf
    • http://ffscs.net/uploads/1/3/0/6/130621214/sikolosepomabos.pdf
    • http://exclusive-rentals-mne.com/uploads/1/3/0/7/130776582/gujovirul_diwekopozevawi_talevaw.pdf
    • http://slibtec.nl/uploads/1/3/0/6/130620449/9344333.pdf
    • http://jppaintingcolorado.com/uploads/1/3/0/6/130621569/6714199.pdf
    • http://publishinginsideout.org/uploads/1/3/0/7/130738924/5642910.pdf
    • http://riesgolicuadora.com/uploads/1/3/0/4/130475892/09ae100c8.pdf
    • http://meliusvendor.com/uploads/1/3/0/4/130488834/tenikagepuzux.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008c08.bin
0783ebca4345d483116e1d45fb0e6c05e1c16f19c6bb592e4467d11b48152838		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C08 9060 bytes
font_01_sfnt_off0000acef.bin
d0ee21efe1ed539e06d2acc91ce4f0a0bb548c180d0a7caa40693e70892b421e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xACEF 2600 bytes

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